occur

【归纳】occur是不及物动词，意思及用法如下：

★意为"发生"，一般不用于进行时态和被动语态。如：

If headaches only occur at night, lack of fresh air and oxygen is often the cause.

★意为"（某想法）出现在脑海中，被想到"，常与介词to连用。如：

Just then a bright idea occurred to me.

I suppose it didn't occur to you to phone the police?

It never occurred to him that she would be so angry.

★意为"存在"。如：

That sound does not occur in my language.

【即学即练】根据括号内的汉语提示补全下面句子（每空一词）。

1. She was in great difficulty, but ________ ________ ________ ________ ________ (她从未想过) to ask anyone for help.

2. Violence of some sort seems ________ ________ (存在) in every society.

3. ________ ________ ________ ________ ________ (他想到这个主意) in a dream.

discourage

【语境展示】阅读下面句子，并试着归纳discourage的意思及用法。

1. Don't let one failure discourage you; try again.

2. The school teachers discourage smoking.

3. All Nell's friends discouraged her from such a dangerous step.

4. My father is a lawyer, and he discouraged me from entering the field.

【自我归纳】discourage是动词，意为：①使泄气（句1）；②阻止，阻拦，劝阻（常用搭配：discourage sth.；discourage sb. ________ sth. / doing sth.）（句2-句4）。

【拓展】

★discouraged adj. 灰心丧气的，沮丧的。如：

He sounded discouraged by the lack of progress in the talks.