She says these activities at bedtime can get kids all excited and make it hard for them to calm down and sleep.

她说，这些睡前活动会让孩子们兴奋不已，让他们很难平静下来睡觉。

youdao

The cold temperature will make it hard.

低温会让它变硬。

youdao

Often the acoustics make it hard to identify where sounds are coming from.

这种声学效果通常会使得声音的来源难以辨别。

youdao

He said life is sometimes really hard, but you can make it a lot better if you try to prepare for it.

VOA: special.2010.05.16

Then, there are antagonists that slow down the amount of neurotransmitters, either because they destroy neurotransmitters or they make it hard to create more.

另一种是抑制剂,抑制剂会抑制神经递质的释放量,有可能是通过破坏神经递质而实现,也可能是通过抑制神经递质的生成而实现

耶鲁公开课 - 心理学导论课程节选

This decision is also hard to make because when you are a backend technology provider, it's like selling a piece of commodity.

之所以这是一个困难的决定还因为,当作为后台技术提供商时，就像出售一件商品似的。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

The IRS diploma database would settle the matter--and make it hard for bad schools to survive.

FORBES: Magazine Article

Such a program could easily make it hard to sell the drug at all.

FORBES: AstraZeneca's Victory Highlights Difficulty Of Cancer Drug Development

The oddities of Japan's party system make it hard to predict what this means.

ECONOMIST: Voters send Junichiro Koizumi a deflating message