Looking up...
It rained off and on all day yesterday.
昨天下了一整天断断续续的雨。
断断续续地;时断时续地
She has been studying English off and on for five years.
她断断续续地学了五年英语。
The machine worked off and on during the test.
在测试过程中,机器时断时续地运转。
强调动作或状态不连贯、间歇性发生。
两者在某些情况下可互换,但'off and on'更强调间歇性和不规律性,而'on and off'更强调偶尔性。例如:'She visits her parents off and on'(断断续续)vs 'She visits her parents on and off'(偶尔)。
切勿将'off and on'直译为'关闭和开启',应根据语境选择'断断续续'、'时断时续'或'间歇性'等中文表达。
组合词,由介词off(结束)和连词and(和)+副词on(继续)构成。首次记录于16世纪初,原指机械设备的间歇运转,后泛化为描述任何不连贯的活动或状态。
常用于描述天气、学习、工作等持续时间较长但不连贯的活动。注意与'on and off'(偶尔)在某些语境下可互换,但'off and on'更强调间歇性和不规律性。