The system has been in operation for six months.
這個(gè)系統(tǒng)已經(jīng)運(yùn)行六個(gè)月了。
The company has been investing in new plant and equipment.
這家公司一直在投資購(gòu)置新機(jī)器和設(shè)備。
A new system has been devised to control traffic in the city.
控制城市交通的新系統(tǒng)已經(jīng)設(shè)計(jì)出來(lái)。
Digital television has been around for some time now.
數(shù)字電視已經(jīng)面市一段時(shí)間了。
A new advance has been made in the control of malaria.
在控制瘧疾方面已取得新的進(jìn)展。