1797. for the duration of在…. 期間
For the duration of this government.
本屆政府執政期間

1798. at an elevation of 高度（尤指海拔）
The city is at an elevation of 2000 meters.
這座城市海拔2000米

1799. in emulation of 趕超；競爭
She worked hard in emulation of her elder sister.
她努力趕超姐姐

1805. in an age of 在….時代
In an age of enlightenment such cruelty is unforgivable.
在文明時代，這麼殘忍是不能寬恕的

1806. at a time of 在….時候
Personal enmities must be forgotten at a time of national crisis.
民族危機當頭，必須捐棄個人恩怨

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