time本身就有“时间”和“次数”的意思.
作“次数”讲时,是可数名词,复数是:times
third time 第三次,讲的是第三次这一次,所以用单数 time.
如果是three times 三次,就要用复数times了.
如:She has been to Beijing for two  times.他已经去过北京三次了。
此句强调去北京的动作已完成,且有三次了,强调完成的状态。
It is the third time he goes to Beijing.这是他笫三次去北京。
此句说明他已经去过北京两次了,第三次去北京的动作正在发生,强调此时的状态。
又如:
How many times do you brush your teeth every day?I brush them three times
你每天刷几次牙
三次。
three times释义:
三次
例句:
He knocked three times and waited.
他敲了三下门就等着。释义:
三次
例句:
He knocked three times and waited.
他敲了三下门就等着。
third time释义:
第三次
例句:
That makes the third time he's failed his driving test!
他这已经是第三次未通过驾驶考试了!