is.

1.A serial killer is on the loose!

有个连环杀手正逍遥法外！

2.He is under the delusion that he is Napoleon.

他患了妄想症, 认为自己拿破仑。

3.It is obvious that he is wrong.

显然他错了。

4.Motion is absolute while stagnation is relative.

运动绝的,而静止相的。

5.My objection is that he is too young.

我反为他太年轻。

6.It is obvious that she is very clever.

很明显，她挺聪明。

7.It is logical that the book is expensive.

书贵很自然的事。

8.The rarer it is, the more it is worth.

物以稀为贵。

9.It is generally admitted that he is a trustworthy person.

大家一致公认他个可信赖的人。

10.He is proud that his wife is accessible to reason.

他的妻子通情达,为此他引以为豪。

11.It's a blessing that the flood is over.

"洪水终于过去了,真幸事。"

12.Whether mercy killing is justifiable is still an open question.

安乐死否正当仍然一个有争论的问题。

13.The rent is reasonable, and moreover, the location is perfect.

这房租, 而且地点优。

14.It is the authors opinion that dermatofibroma is a post-inflammatory reaction related to scar tissue.

病史认为皮肤纤维瘤类似于瘢痕组织的一种炎症后反应。

15.It is patent to all that this is a good chance.

大家都明白这一个好机会。

16.Typically the rock is massive, but commonly it is flaggy or schistose.

这类岩石典型地呈块状，但常呈薄板状或片化。

17.It is ridiculously absurd to believe that the number 13 is unlucky.

相信数字13个不吉祥的数字荒唐可笑的。

18.The reason for this is that this plane is also a bicycle.

"其原,这架飞机又一辆自行车。"

19.This is a yardstick for measuring whether a person is really progressive.

这衡量一个人否真正进步的标准。

20.I'd lay odds that the person responsible is an insider.

我敢打赌负责人一定圈内人。