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This can make it harder to breathe.
这将使呼吸变得更为困难。
youdao
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Lighter than air, but harder to breathe.
轻于空气，但难以呼吸。
youdao
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People who travel to the mountains find it harder to breathe.
到山上旅行的人发现这里呼吸比较困难。
youdao
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People who travel to the mountains find it harder to breathe.
到山上旅行的人发现这里呼吸比较困难。
youdao