于去年五月
In May last year
以上为机器翻译结果，长、整句建议使用 人工翻译 。
他于去年五月份正式就任总统。
He was installed as President last May.
《牛津词典》
该党于去年五月赢得了绝对的胜利。
The party won an overwhelming victory last May.
youdao
得力于去年五月安装在哈勃空间望远镜上的两台新设备，对臭虫星云的认识得以焕然一新。
The Bug Nebula is getting a makeover thanks to two new instruments mounted on the Hubble Space Telescope last May.
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