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1. Doctor believed that his low sperm count was the problem.

医生认为他的精子数太低是问题所在。

2. With a low-pitched rumbling noise, the propeller began to rotate.

伴随着隆隆的低沉噪声，螺旋桨开始旋转起来。

3. We're a bit low on bed linen. You'll have to make do.

我们的床单有些次，您将就着用吧。

4. The official number of people carrying the AIDS virus is low.

艾滋病病毒携带者的官方数字并不高。

5. Keeping inflation low is the keystone of their economic policy.

将通货膨胀率保持在较低水平是他们经济政策的主旨。