twice

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twi-, two, -ce, 副詞接尾辞.

twice

twice: [12] Twice was formed from Old English twige ‘twice’ (itself based on twi-, the combining form of two) and the genitive ending -s, which was used for creating adverbs, such as always, nowadays, once, thrice, etc.
=> two

twice (adv.)

late Old English twies, from Old English twiga, twigea "two times," from Proto-Germanic *twiyes (cognates: Old Frisian twia, Old Saxon tuuio), from PIE *dwis-, adverbial form of *dwo- "two" (see two). Spelling with -ce reflects the voiceless pronunciation.

Life is as tedious as a twice-told tale
Vexing the dull ear of a drowsy man.
["King John," III.iv.]

Think twice, then speak was an "old Prouerbe" by 1623. At twice, though less common than at once, means "at two distinct times; by two distinct operations."

1. The car passed over the body twice ，once backward and then forward.

あの車はあの人を2回往復して、まず逆に圧延して、それから前に圧延しています。

2.They are in twice daily radio contact with the rebel leader.

彼らは毎日2回無線で反乱軍の首領と連絡を取っている。

3.The legislation has twice been rejected by the House of Lords.

この法規は上院で2度否決された。

4.Liam surprised his tutors by twice failing a second year exam.

リアムは2回も大学2年生の試験に合格できなかったので、指導者たちは驚いた。

5.I phoned twice a day,leaving messages with his wife.

私は毎日2回電話をかけて、妻に伝言を頼む。