[书] offer one's service to sb. ;
As soon as the war declared, many men volunteered.
一经宣战, 就有很多人投效军队.
The rate of return this year is slightly better than that of past years.
今年的投效比往年略有起色.
I've decided to devote myself to the nation after finishing my study.
我已经决定学成后投效祖国.
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