放开的英文：
unleash
release

参考例句：

Open the sluice-gates of a reservoir.
放开水库的闸门。

Let go,you randy old goat!
放开我，你这老色鬼！

After natural gas deregulation, this situation may also develop in the United States
随着天然气价格的进一步放开，这种情况也可能在美国出现。

Allow flexibility in the policy and enliven the economy
放开搞活

Let the rope run free.
把绳子放开.

"To free (liberalize, decontrol, lift the control over) the grain prices"
放开粮食价格

slip a dog from its leash
松开皮带把狗放开

She release the clutch and the car begin to move.
她放开离合器，汽车就动了。

She slipped a dog from its leash.
她松开皮带把狗放开。

"Take hold of my hand, and don't let go."
握住我的手别放开。

unleash是什么意思：
v. 解开...的皮带；解除...的束缚；放纵；宣泄，发泄；发动

He unleashed a thunderbolt by announcinghis resignation.
他宣布辞职好似晴天炸雷一般.

Don't unleash your students.
别给你的学生松绑。

The announcement unleashed a storm of protest from the public.
公告引发了一场公众的抗议风暴。

Go at once, or I will unleash my dog on you!
立刻走，要不我就放我的狗咬你！

He could unleash the mobs in the Arab world against us.
他本来可以发动阿拉伯世界的下层群众反对我们。

release是什么意思：
v. 松开，排出，免除
n. 放松，发布的新闻

release (of a pollutant)
排出污染物; 放出污染物

release of nationality
国籍解除; 放弃（脱离）国籍

memorandum of release
放弃索取换地权益备忘录

margin release mechanism
极限释放机构

Someone released on probation or on parole.
在鉴定期或有条件地被释放的罪犯。