默里说杰克逊视力很差，卫生习惯也不好。
Murray reported that Jackson had poor eyesight and, perhaps, poor hygiene.
蝙蝠视力很差，它们通常用超声波定位来导航。
Some bats with poor eyesight depend on echolocation to navigate.
因为水生动物的视力很差，科学家猜想它们更依赖听力。
Researchers thought some freshwater species might rely on sound because of poor visibility.
老妇人的视力很差，所以丑小鸭在这里住了一些日子。但是母鸡和猫却在打丑小鸭的主意。
The old woman's sight was very bad. So the duckling lived there for a few days. But the hen and the cat were mean to the duckling.
她的视力和听力很差，看不清也听不清。
Her eyesight and hearing are so poor that she can't see or hear clearly.
她的视力和听力很差，看不清也听不清。
Her eyesight and hearing are so poor that she can't see or hear clearly.
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