It was necessary, therefore, to invent instruments that neither slumbered nor slept.
因此，有必要发明一种仪器，既不打盹儿，也不睡觉。
新概念英语第四册
Lesson 42 Recording an earthquake
📚 句中词汇解析
从本句中提取的重要词汇
adj. 必要的;强制的;必然的;不可避免的;
n. 必需品;
💡 necess必要 + ary 表示有...性质的， → a.必要的；必然的
"Vitamin D is necessary to aid the absorption of calcium from food."
从食物中吸取钙需靠维生素D的帮助。
近义：indispensable, inevitable, mandatory, needful, obligatory, obliged
反义：needless, pointless, profitless, purposeless, redundant, reiterative
adv. 因此;所以;故;乃;
💡 there这样+fore无实义 → 因此，所以
"He lost his health, and therefore his difficulties increased."
他身体虚弱, 因此更增加了他的困难.
近义：hence, hencewith, hereupon, appropriately, avaunt, properly
vt. 发明，创造;虚构;
💡 in(upon)+vent(come)→发明；虚构
"We have to invent a new method for sneaking prisoners out without being noticed by the guards."
我们必须想出新的办法使囚犯们偷偷溜出去而不被看守发现.
近义：improvise, make, noodle, vamp, coin, adlib
反义：recopy, reduplicate, replicate, reproduce, trace, transcribe
neither
['niðɚ]
adj. （两者）都不的;
pron. 两者都不;
adv. 两个都不;既不…也不;
conj. 也不;既不;
💡 n(not)+either→既非；皆不；两者都不
"Neither party is willing to compromise and herein lies the problem."
双方都不愿意妥协，问题就在这里。
近义：no, either
反义：likewise, moreover, too, withal, besides, then