only once
英 美
只此一遭
... 头一遭乘船 take a ship for the first time 只此一遭 for once in one's life; only once 地道风 air through tu el; air through tunnel ...
She has been beaten only once in six starts.
她参加了六次比赛,只败过一次。
Ann wore it only once.
安只穿过它一次。
The operation should be done only once for each mode.
此操作对于每个模式来说只进行一次。