China boasts the world's earliest observatory, built in Nanking in 1385 in the Ming Dynasty ( 1368 A . D .-1644 A . D . ), three centuries ahead of the Greenwich Observatory built in Britain in 1670.

I got a D+.

我得了个D+。

First, the magician should speak with a . k . a. the wizard -- before the " performance. "

首先, 在表演开始前魔术师应与助手(也可以叫 巫师 )说几句话.

Curiously, 1913 is also the year when John Sinclair , a . k . a . Lord Lister, retires.

有趣的是, 1913年也是JohnSinclair退休的那年.

How about the little mini-monitor in the back ( a . k . a. the LCD viewfinder )?

相机后面的小监视器 ( 又称液晶取景器 ) 效果怎样?

Our math teacher, a . k . a . " Darth Vader , " is very serious and strict.

我们的数学老师非常严肃和严厉, 又被称为‘ 达斯维达 ’.

I asked for a wake-up call at 6.30 a.m.

我请他们在早晨6:30打电话叫醒我。

Roll-call will be at 7 a.m.

早晨7点钟点名。

Sometimes I'd even call up at 4 a.m.

有时我甚至早上四点都打电话。

The child's birth occured at 2 a.m.

这孩子凌晨两点出生.

The time appointed for the mass meeting was 9 a.m.

群众大会上午9点届时召开.

Bus service starts at 5 a.m.

公共汽车早上五点出车.

The train will depart at 7:30 a.m.

早七点半发车.

The station transmits from 6 a.m. until midnight.

电台从早晨六点开始播音，一直持续到半夜

It is barbarous to call at 5 a.m.

清晨五点给人打电话是缺乏教养的行为.

Every pupil is supposed to be in his classroom at 9 a.m.

上午9点时每个学生都应当在教室里.

Police said that the blast occurred at 9 a.m.

警方说这次爆炸发生在上午九点.

When I got back at about ten a.m. I was frozen to the marrow.

我早上大约10点钟回来的时候感到寒气透骨。

Breakfast is available to fishermen from 6 a.m.

从早上6点开始向渔民提供早餐。

Two people in the flat recalled hearing a loud crash about 1.30 a.m.

公寓楼里有两个人回想起凌晨1点半听见了一声巨响。

He once sleepwalked to the middle of the road outside his home at 1 a.m.

有一次，他在凌晨1点钟梦游走到了家门外的马路中央。