1、plummet

（数量、比率或价格）骤然下跌，暴跌

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

东京股价已连续第6天猛跌1Zxgavc~xV@QPp@l0K。

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

首相的支持率在近几个星期已骤跌至前所未有的低点avS5VTO3AzZkzFRQP3@。

（通常指从高处）快速落下，陡直掉下

The jet burst into flames and plummeted to the ground.

这架喷气式飞机突然着火，急速坠地zEe70E(vNzmY^=。

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

车子在弯道处失去控制，一头扎下堤岸GPwI7&nqm#;+z1W^Ag。

2、upgrade

改良；更新；升级

Helicopters have been upgraded and modernized.

直升机已经更新换代，装配了现代化设备GpEvV8%,&P+PcJ2VP(.=。

Medical facilities are being reorganized and upgraded.

正在对医疗设施进行重组和升级@+5h+!3t;3)。

擢升；晋升；提升；提拔

He was upgraded to security guard.

他被擢升为保安Gl,O6|AV)6(z8。

(使)升级到更高待遇;(使)升舱

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

您可以将自理膳食旅店升级为酒店5|J18r+cJ*+Lg]N7。

ascYx9e0,k,^_k~9E=B^nE]v2A5!Pe78AC9[G[GVZOaL4W 来源:可可英语 //m.moreplr.com/menu/201604/437065.shtml