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alibi n. 不在犯罪现场，不在场证明，当时不在场的申辩（可数名词）
formal statement or evidence that a person was in another place at the time of a crime
他有那天上午不在场的证据/证明。
He had an alibi/alibis for that morning.
'At the time the murder was committed, I was travelling on the 8 o'clock train to London,' said the man.
“在凶杀发生的时候，我正坐在8点钟开往伦敦的火车上。”那人说。
commit v. 犯（罪、错）
① If someone commits a crime or a sin, they do something illegal or bad.
vt. 犯（罪），做（错事、坏事等）
他以前从来没有犯过罪。
He has never committed any crime before.
今天早上8点钟发生了一起凶杀案。
A murder was committed at 8 o’clock this morning.
② ~ sb/oneself (to sth/to doing sth)make it impossible for sb/oneself not to do sth, or to do sth else, esp because of a promise; pledge sb/oneself
使某人[自己]不能不做某事或不做另事（尤指因有承诺）; 向某人[自己]保证: （经常与反身代词连用）
在缔结婚姻之前，你们应该更好地相互了解。
You should know each other better before committing yourselves to marriage.
他使他的朋友答应参加比赛。
He has committed his friend to taking part in the race.
