20.take celestial azimuth and find compass error on each watch if the weather is fine.

如天气好，每一测取天体方位求出罗经差。

We have a three-shift system - that's three eight-hour shifts each weekday.

我们采倒制，也就是个八小时每天一。

I am Millie from Class 1, Grade 7.

我是来自七年级一的米莉。

There are Tri-State Rail System trains leaving every half hour for the city.

州铁路系统开往这个城市的火车每半个小时一。

When does the next train leave for New Orleans?

下一开往新奥尔良的火车什么时候开？

Yes. When is the next train to London?

是的。下一去伦敦的火车是什么时候?

No. The next train leaves at a quarter to ten at Platform 11.

不需要。下一火车在十点差一刻从 11 号站台发车。

" No, " she said, " it had been a really early one."

”不是的，“她回答，“飞过很早的一了。”

Yes. When is the next train to London?

请问下一去伦敦的火车是什么时候？

Oh, let me check. It leaves in twenty minutes.

让我查一下哈，下一火车20分钟后出发。

After the fort falls, people scramble to catch the last train to Paris.

要塞陷落后，人们仓皇赶路开往巴黎的最后一火车。

'The next train goes early in the morning.

“下一火车清晨开出。

It's more expensive and leaves once every hour, but it only takes 50 minutes.

价格比较贵，每小时一，但只需要50分钟。

Buses leave every 30 minutes and each tour takes a total of 50 minutes.

巴士每30分钟一，每次旅行总共需要50分钟。

One squad of soldiers was detached to guard the important road and bridge.

一士兵被派去防守重要的路段和桥。

Excuse me. When will the next train leave?

抱歉。请问下一火车何时开？

Which flight do you want to change?

您想改签到哪一航呢？

I missed that train, and then another, before I could get myself away.

我误了那车，又误了下一，然后才勉强离开。

When does the next flight to Philadephia leave?

下一往费城的机何时起飞？

We missed our bus which meant waiting six hours until the next one.

我们错过了公交车，那就意味着我们要等六个小时才能等到下一。