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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。
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。
（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。
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。
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。
Medical facilities are being reorganized and upgraded.
正在对医疗设施进行重组和升级。
擢升；晋升；提升；提拔
He was upgraded to security guard.
他被擢升为保安。
(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。
