however, for example主要放在句首和句中并用逗号隔开，有时也可以放在句末。

(1)放在句首

However, many customers found the smell of this product distinctly off-putting.  

然而，很多顾客觉得该产品有一股异味，非常难闻。

For example, one college student was missing for several days.  

例如, 一个大学生失踪了好几天.

For example, people in Israel dip sweet apples into honey.  

比如, 以色列人吃甜苹果蘸蜜.

For example, we saw a white limo that was very long.  

例如, 我们看到一个很长的白色轿车.

(2)放在句中

The mechanics of the job, however, have changed little since then.  

不过，工作流程从那以后就几乎没有任何变化。

The deal with Chelsea may not, however, be dead.  

不过，与切尔西的交易或许还有戏。

What is missing, however, is an internal, artistic cohesion.  

不过，缺乏的是一种内在的艺术凝聚力。

Japan, for example, has two languages.  

譬如说, 日本就有两种语言.

Take, for example, the simple sentence: "The man climbed up the hill" 

以Themanclimbedupthehill这个简单句为例。

Many factors are important, for example class, gender, age and ethnicity.  

许多因素都很重要，如阶级、性别、年龄及民族。

(3)放在句末

There are many sources of air pollution ; exhaust fumes, for example. 

空气污染有许多来源, 例如废气.