Once waves have been generated,
一旦波浪形成，
新概念英语第四册 Lesson 40 Waves

📚 句中词汇解析

从本句中提取的重要词汇

once [wʌns] 词频1
adv. 一次，一趟;一倍;曾经;一旦; conj. 一旦…就…;一经; n. 一次，一回;
💡 on=one一+ce次 → 一次
"Once in the bloodstream, the bacteria adhere to the surface of the red cells."
细菌一进入血液里，就附着在红细胞表面上。
近义：heretofore, occasionally, onetime, previously, sometimes, thereinbefore
waves
n. 波（wave的复数形式）
近义：surf, surge, groundswell
generated
a. 生成的；发生的

📚 更多「新概念英语第四册」例句

Spiders are not insects, as many people think, nor even nearly related to them.
许多人认为蜘蛛是昆虫，但它们不是昆虫，甚至与昆虫毫无关系。
Some old people are oppressed by the fear of death.
有些老年人因为怕死而感到烦恼。
Eventually the turtle has been butted all the way down to the floor of the tank.
这只海龟最终被撞到池底。
and of what had previously been wrong with his wife,
也不知道他妻子以前得的是什么病，
and particularly by a new consciousness of the philosophical undercurrents in the scientific revolution,
尤其是以科学革命中哲学潜流的新意识为依据，
Two main techniques have been used for training elephants,
驯象有两种主要的方法，