1. The temperature dropped abruptly.
    气温骤降。

1. 突然：average 平均的 | abruptly 突然 | acquired 后天习得的

2. 突然地, 唐突地：abruption || 分裂, 分离 | abruptly || 突然地, 唐突地 | abruptness || 突然, 唐突, (举止, 言谈等的)粗鲁无理

3.

3. 突然的：abruption test ==> 断裂试验,爆破试验 | abruptly ==> 突然的 | abruptly stressed ==> 突加应力

1. quickly and without warning

    e.g. he stopped suddenly

    Synonym: suddenlyshortdead