I need you to get this done by six o 'clock.
我需要你在六点之前把这件事做好。
We suggest that the test (should) be done by 12 o 'clock.
我们建议这项实验应在12时前完成。
A person who has not done one half his day's work by ten o 'clock, runs a chance of leaving the other half undone.
一个人要是到十点钟还没有做完他一天工作的一半，就大有可能剩下那一半也做不完。
We're leaving at six o 'clock, and hope that we will have done most the journey by lunch time. .
我们将在六点时动身，希望在午饭前走完大半路程。
We're leaving at six o 'clock, and hope that we will have done most the journey by lunch time. .
我们将在六点时动身，希望在午饭前走完大半路程。
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