There is a frequent bus service into the centre of town.

公共汽车有很多班次开往市中心区。

【相关链接】

frequently adv. 频繁地；经常

We must speak English frequently in order to improve our spoken English.

为提高英语口考，我们必须经常说英语。

7.tie n. 领带；纽带；联系；束缚v. 系；捆

【典型例句】

He was still a young man and he did not want any ties.

他还年轻，不想有任何束缚。

She tied the newspapers in a bundle.

她把报纸扎成一捆。

He had to tie his hands together.

他不得不把他的双手绑在一起。

【相关链接】

(1)tie in with sth.和......相符；相配

The evidence ties in closely with what we have already known.

这一证据和我们已掌握的情况完全相符。

(2)tie...to... 把......拴在......

He tied his horse to the stick.

他把马拴在木桩上。

(3)tie up 捆起；拴住

【典型例句】

Rabbits and foxes are common in Britain.

兔子与狐狸在英国十分常见。

How will these changes affect the common sense?

这些变化会怎样影响一般人呢?

This useful feature is common to both the two computers.

这两种电脑都有这种实用的特点。

【相关链接】

common, usual, regular与ordinary

common 普通的；常见的；共同的；共有的。

usual 通常的；习惯的；经常发生的事，如自然发生的事、根据社会或个人习惯所做的事情。

regular 通常的；常例的；强调遵循事物既定的或自然规律。

ordinary 普通的；平凡的；强调普通；寻常以及缺乏优越的性质。

9.appearance n. 外表；外貌；出现；露面

【典型例句】

The sudden appearance of a security guard caused them to drop the money and run.

保安人员突然出现，他们丢下钱就跑了。

The Dutch player will make his first appearance this Saturday.

这位荷兰球员将在本周六首次亮相。

She had never been greatly concerned about her appearance.

她从来不怎么注重外表。