那时用英语怎么写

那时 [na4 shi2]
at that time

参考例句
士兵们(那时)正在挖战壕。
The soldiers were digging trenches.
他那时50岁头发就渐白了.
He was 50 and greying.
刘易斯那时仍在襁褓中(即刘易斯那时仍是个婴儿)
Lewis was in long clothes then.
我无法向你描述那时我的感受。
I can't describe to you what I felt at that moment.
罗马帝国在那时已经衰亡。
At that time, the Roman Empire had already decayed.
那时我在一辆拥挤的公共汽车上。
I was on a packed bus.
他们那时赚的钱养活不了自己。
They couldn't earn enough money to maintain themselves.
在那时是一桩很棘手的事。
It was then a hard nut to crack.

at that time

at that time

when

that time

(on)that day
(at)that time

(at)that time