Who can tell me the difference between "at the window"and "by the window"

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Question description

I am a nonnative enlish speaker ,often feel boring those similar phrases.


a.does "break your leg" often used as the same meaning of "Good Luck!"?

b.what's the meaning of "air-dfense"?

c.for"The adult female attains a length of four inches.",what's four inches?

d.hit out =?

Tutor Answer

(Top Tutor) Daniel C.
School: Rice University
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