1、plummet

（數量、比率或價格）驟然下跌，暴跌

In Tokyo share prices have plummeted for the sixth successive day.

東京股價已連續第6天猛跌1p;o8Jcy#|la;2NpW。

The Prime Minister's popularity has plummeted to an all-time low in recent weeks.

首相的支持率在近幾個星期已驟跌至前所未有的低點&my1I.a73v2;42n2quK。

（通常指從高處）快速落下，陡直掉下

The jet burst into flames and plummeted to the ground.

這架噴氣式飛機突然著火，急速墜地@uz5Fw60W@|I5uJ。

The car went out of control on a bend and plummeted down an embankment.

車子在彎道處失去控制，一頭扎下堤岸uUTw7Uu0WRa32VF%。

2、upgrade

改良；更新；升級

Helicopters have been upgraded and modernized.

直升機已經更新換代，裝配了現代化設備-)Lq=U4XQM。

Medical facilities are being reorganized and upgraded.

正在對醫療設施進行重組和升級2bvv^6@]~c1C%bF&*1。

擢升；晉升；提升；提拔

He was upgraded to security guard.

他被擢升為保安+-GElBfof&[,*3tj*。

(使)升級到更高待遇;(使)升艙

You can upgrade from self-catering accommodation to a hotel.

您可以將自理膳食旅店升級為酒店2YfeZR.]d^YdCS。

.dtBsSReJP3~(T*@uRVkUb0i.oQ1Z0YHEwiY7u(ptc=uBsb 來源:可可英語 http://www.ccdyzl.cn/menu/201604/437065.shtml