All that movement makes it hard for predators to see individuals in a large group.

所有这些运动使得捕食者很难在一个大群体中看到个体。

youdao

Heat makes it hard to breathe.

过高的热度导致呼吸困难。

youdao

The depth (深度) makes it hard for scientists to find the whale fall.

深度使科学家很难找到鲸鱼坠落的地方。

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Malaria is caused by a complex parasite that makes it hard to target with a vaccine.

VOA: standard.2010.01.20

I think that it makes it hard for that particular area of scientific research to go forward.

我想在这方面的科学研究很难推进。

生物克隆是热点问题 - SpeakingMax英语口语达人

It even, I think, identifies the divine and the human, makes them hard to tell apart;binds them, even while we are being confronted with their difference.

我想，甚至这，使圣与人，难以被分辨，把他们联结在一起，尽管我们也看到,圣与灵之不同。

耶鲁公开课 - 现代诗歌课程节选

Their unconventional nature makes it hard to compare binary options with regular commodity contracts.

FORBES: Magazine Article

It's just the way we've been playing, and it makes it hard to cover.

WSJ: Top-seeded Syracuse surging as tournament nears

They attack microbes in a unique way that makes it hard for resistance to develop.

FORBES: Magazine Article