1、common

a、常见的;普遍的

His name was Hansen, a common name in Norway.

他的名字叫汉森，在挪威是一个常见的名字。

Oil pollution is the commonest cause of death for seabirds.

石油污染是造成海鸟死亡最常见的原因。

b、共有的;共同的

Moldavians and Romanians share a common language.

摩尔达维亚人和罗马尼亚人使用同一种语言。

Such behaviour is common to all young people.

这种行为在年轻人中司空见惯。

c、(礼貌等)通常的，起码的

It is common decency to give your seat to anyone in greater need.

给更有需要的人让座是最起码的礼貌。

He didn't have the common courtesy to ask permission.

他连邀准这种最起码的礼貌都没有。

2、alternative

a、可供选择的；可供替代的

New ways to treat arthritis may provide an alternative to painkillers.

关节炎的新疗法可能是止痛药之外的另一种选择。

b、备选的；备用的；其他的

There were alternative methods of travel available...

还有其他可选的旅行方式。

They had a right to seek alternative employment.

他们有权另谋高就。

c、非传统的；另类的

unconventional parents who embraced the alternative lifestyle of the Sixties.

欣然接受60年代另类生活模式而不因循守旧的父母

If you like alternative comedy you'll love this book.

如果你喜欢另类喜剧的话，你就会喜欢这本书。