88　at once…and

◎ at once…and意为“既……又”，相当于 both…and，连接两个同等成分。

His father is at once stern and tender. 他的父亲既严肃又仁爱可亲。

He is at once a statesman and a writer. 他既是政治家，又是作家。

Einstein was at once great and simple. 爱因斯坦既伟大又平凡。

Hearing the news，I was at once glad and worried. 听到这个消息，我又喜又忧。

The lady is at once sweet and charming.（=both sweet and charming）那位女士既温柔又妩媚。