英语中stick to, cling to, adhere to有什么区别

stick
to(sticking,
stuck, sticks)

1.
PHRASAL VERBIf you stick to something or someone when you are travelling,
you stay close to them. 紧跟

例：
Let's stick to the road we know.
我们沿着熟悉的路走吧。

2.
PHRASAL VERBIf you stick to something, you continue doing, using, saying,
or talking about it, rather than changing to something else. 坚持

例：
Perhaps he should have stuck to writing.
或许他本该坚持写作。

3.
PHRASAL VERBIf you stick to a promise, agreement, decision, or principle,
you do what you said you would do, or do not change your mind. 坚持
(诺言、协议、决定或原则)

例：
Immigrant support groups are waiting to see if he sticks to
his word.
支持移民的团体正观望他是否遵守诺言。

cling to

1. 粘上；贴上：
The mud clung to my shoes.

泥粘在我的鞋子上。

2. 紧紧抓住：
The mother clung to her son as he said good-bye.

儿子告别时，母亲紧紧抓住他不放。

3. 挨近，靠近：
Dark clouds cling to the mountains.

乌云压山。

4. 坚持，执著：
He clings to the belief that one day he will be able to
return to his native home.

他坚信有朝一日他会返回故乡。

5. 依恋；怀念：
She clings to her happy childhood.

她总怀念她的欢乐的童年。

adhere to

1. 粘住，粘附在…上，附着：
a stamp adhering to an envelope

一张贴在信封上的邮票

2.
坚持(决心、习惯、意见等)；墨守，遵守；忠于(思想、意见、信念、领导人等)；依附；固执，固守，拘泥(意见、规章制度等)：
We adhere to the contract.

我们遵守契约。

stick to 主要是坚持的意思，坚持做某事常用。
cling to 抓住 形容某人的行为常用。
adhere to 常用于土壤临近，挨着某地。

分别是“坚持、抓住、遵守”的意思。区别还是很明显的。