By Levels

Library

EXP: 08888
HITS: {{lyricTraining.hits}}888
STREAKS: {{lyricTraining.streaks}}888
TIME: {{lyricTraining.timeout / 1000}}88
{{word.word}}

{{cue.translated_text}}

{{lyricTraining.hint}}

x{{playblackSpeed.toFixed(2)}}

Loading ..

Not Found

{{annotation.word}} ({{annotation.pos_simplify}})

/{{annotation.phonetic}}/

{{annotation.translation}}

{{annotation.name}}

{{annotation.sub_type}}

{{annotation.definition}}
Back

Games & Quizzes

Training Mode - Typing
Fill the gaps to the Lyric - Best method
Training Mode - Picking
Pick the correct word to fill in the gap
{{game.name}}
{{game.description}} Requires {{game.required_annotions}} vocabulary annotations

Congratulations! You gained {{totalPoint}} XP

You may need to watch a part of the video to unlock quizzes

Don't forget to Sign In to save your points

Repeat Skip ({{game.question_index}}/{{game.questions.length}})
{{part}}
Repeat Skip ({{game.question_index + 1}}/{{game.questions.length}})
{{choice.text}}
{{choice.text}}

Make correct pairs from two columns

{{lyricTraining.finished && lyricTraining.timed_out ? 'Timed Out' : 'Challenge Accomplished'}}

PERFECT HITS {{lyricTraining.stats.PERFECT_HITS}} +{{lyricTraining.stats.PERFECT_HITS * 20}}
HITS {{lyricTraining.stats.HITS}} +{{lyricTraining.stats.HITS * 10}}
LONGEST STREAK {{lyricTraining.stats.LONGEST_STREAKS}} +{{lyricTraining.stats.LONGEST_STREAKS * 10}}
REMAINING TIME {{lyricTraining.timeout / 1000}}s +{{lyricTraining.timeout / 1000}}
TOTAL +{{lyricTraining.exp}}
{{word.word}} - {{dictionary.definition[0].phonetic || ("/" + dictionary.phonetics +"/")}} - {{word.translation}}

We couldn't find definitions for the word you were looking for.
Or maybe the current language is not supported

{{simpleDefinition.pos}}

{{simpleDefinition.def}}

{{word.word}}

Sentences & parts of speech:

  • {{tag.normal}} {{tag.pos_name}}

  • {{c.startTime | duration}}


    {{c.translated_text}}

All {{pos.pos_simplify}}
{{a.word || a.name}}
/{{a.phonetic}}/
{{a.type || a.sub_type}}
{{a.translation}} 		{{a.definition}}

Angle of x' axis in Minkowski spacetime | Special relativity | Physics | Khan Academy

60,078 views

Khan Academy

Video Language:

  • English

Caption Language:

  • {{captionLanguage | language_name}} ({{captionLanguage}})

Accent:

  • English (US)

Speech Time:

92%
  • 6:47 / 7:21

Speech Rate:

  • 207 wpm - Fast

Category:

  • Education

Tags :

Intro:

Video Vocabulary

allowed

/əˈlou/

verb

To let or permit someone do something.

certain

/ˈsərtn/

adjective pronoun

Definite, fixed. some.

reference

/ˈref(ə)rəns/

noun verb

Note in a book, etc. giving source of information. provide book or article with citations of sources of information.

initial

/iˈniSHəl/

adjective noun verb

existing at beginning. first letter of name or word. authorize document by signing with initials.

inertial

/iˈnərSHəl/

adjective

relating to or arising from inertia.

observed

/əbˈzərv/

verb

To obey or follow laws, rules, or customs.

relative

/ˈrelədiv/

adjective noun

(Grammar) referring to words that appear earlier. person connected by blood or marriage.

absolute

/ˈabsəˌlo͞ot/

adjective noun

Complete; total; pure; not limited in any way. value or principle.

passage

/ˈpasij/

noun verb

Process of moving through time. subject microorganisms or cells to passage.

interesting

/ˈint(ə)rəstiNG/

adjective verb

Taking your attention; making you want to know. To make someone want to know about something.

actually

/ˈak(t)SH(o͞o)əlē/

adverb

as truth or facts.

passing

/ˈpasiNG/

adjective noun verb

going past. passage of something. To spend time doing or happening.

travelling

/ˈtravəl/

adjective noun verb

Moving from one place to another, especially to perform or while working, etc.. The activity of making journeys. make journey.

velocity

/vəˈläsədē/

noun

speed of something in given direction.

regardless

/rəˈɡärdləs/

adverb

Without being affected or concerned by something.

Q
W
E
R
T
Y
U
I
O
P
A
S
D
F
G
H
J
K
L
Z
X
C
V
B
N
M