骆驼是唯一在干旱时产奶的动物。
Camels are often the only animals that produce milk during a drought.
在干旱时，每天有几小时停止供应自来水。
The water was turned off for several hours a day during the drought.
该基因可以在干旱时，干预由生物因素引起叶片脱落。
These had a gene added to interfere with the biological causes of leaf loss during drought.
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