S71. submerge-S72. subscribe-S73. sudden

submerge

构词：sub-（下）＋merg（沉没）＋e

下沉 v. 淹没, 沉浸于。

相关：merge, emerge, emergency, immerse

搭配：submarine/ hippos/ water submerge; submerge oneself/ land

近义：sink, drown, swamp, plunge, overflow, overwhelm

subscribe

构词：sub（下）＋scribe（写）

写下 v. 签署, 订阅, 赞成。

相关：ascribe, describe, inscribe, prescribe, transcribe

搭配：subscribe to a newspaper / channel / view / doctrine

近义：give, donate, contribute; support, advocate, endorse

考点：积极正面方向

sudden

构词：sud（= sub 下）＋den（= down）

掉下 adj. 突然的, 意外的

相关：suddenly

搭配：sudden change / urge / departure / death; all of a sudden

近义：unexpected, abrupt, impulsive; quick, rapid, swift