The clouds had come down so suddenly we had no warning.
乌云突然出现，我们丝毫没有觉察。
高三英语课文
Unit 23 The find of the century
📚 句中词汇解析
从本句中提取的重要词汇
adv. 意外地，忽然地;奄;勃;霍然;
💡 sudden突然的 + ly ...地 → adv.突然地
"Suddenly he found himself awake and fully alert."
突然他发觉自己醒了过来，而且高度警觉。
近义：impromptu, inadvertently, abruptly, offhand, overnight, sharply
反义：progressively, slowly, sparingly, stingily, inchmeal, consecutively
n. 警告;征候，预兆;前车之鉴;
adj. 警告的;告诫的;引以为戒的;
v. 警告( warn的现在分词);提醒;告诫;预先通知;
💡 warn警告+ing名词后缀 → 警告
"a coded warning of a bomb at the airport"
告知机场有炸弹的密码警报
近义：notice, notification, prevention, word, caution, cautioning
vi. 来;开始;出现;发生;
vt. 做;装扮…的样子;将满（…岁）;
int. 嗨！;
"The time has come for action if these beautiful animals are to survive."
若要使这些美丽的动物能生存下去，现在就要行动起来。
近义：impersonate, perform, personify, portray, represent, stage
反义：leave, absquatulate, retire, retreat, scat, split
adv. （坐、倒、躺）下;向下;（表示范围或顺序的限度）下至;
prep. （从高处）向下;（表示位置）在…的下方;（表示方向）沿着…向下;（表示时间）自…以来;
adj. 向下的;沮丧的;计算机或计算机系统停机;（以…）落后于对手的;
n. （鸟的）绒羽;绒毛;软毛;汗毛;
vt. 放下;（尤指大口或快速地）喝下;使摔倒;击落（敌机等）;
vi. [常用于祈使句中]下去;下来;卧倒;下降;
💡 音“铛”，铛的一声向下 落
"Calm down! Don't get so agitated."
冷静下来！别那么激动。
近义：lint, fluff, fuzz, ingurgitate, quaff, swallow
反义：above, overhead, upstairs, upward, upwards, aloft