Contain

Definition: 1. Have or hold (someone or something) within.包括；2. Control or restrain (oneself or a feeling); prevent (a severe problem) from spreading or intensifying.控制，克制，抑制（感情），防止…蔓延（或恶化）[Oxford Dictionary]

Example:

The cigarettes were thought to contain cannabis.

人们认为香烟含有大麻。

She was unable to contain her excitement.

她无法抑制内心的激动。

It’s difficult to contain an epidemic.

控制流行病的蔓延很难。

Restrain

Definition: Prevent (someone or something) from doing something; keep under control or within limits. 阻止，制止；遏制[Oxford Dictionary]

Example:

She was so angry that she could hardly restrain herself.

她气得几乎都控制不住自己。

Detective 1 was explaining to me how it's extremely difficult to restrain someone without hurting them.

1号探员正在向我解释，为什么在不伤害人的情况下控制住人极其困难。

Some say there is a need to restrain public spending.

有些人认为需要控制公共支出。