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 ...
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。