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1·Why did the fishes in the pond die off?

为什么池塘里的鱼都死了？

2·The largest, oldest trees would progressively die off and tend not to be replaced.

最大、最老的树会逐渐死去，并且往往不会被取代。

3·As a day-to-day essential, it will die off with the generation who read print newspapers.

作为一种日常必需品，它将随着阅读纸质报纸的一代人而消亡。

4·Contraction of front and side parts as cells die off was observed in some subjects in their thirties, but it was still not evident in some sixty and seventy-year-olds.

随着细胞的死亡，有些人大脑前部和侧部的收缩，在三十多岁时就能观察到，但是也有些人直到六七十岁依然不明显。

5·There have been reports of poultry die off in her village.

有报道称，病人所在的村庄有家禽死亡情况。

6·Without the gel, scientists say, the bacteria die off.

科学家说，如果没有这种凝胶，细菌将无法存活。

7·If its stem cells are eradicated, the rest of a tumour may die off.

如果癌症的干细胞被消灭了，其他的肿瘤组织或许会死掉。

8·If sharks die off, you could have a food chain Whac-a-Mole, scientists say.

科学家说，如果鲨鱼灭绝，就会象“打地鼠”游戏一样引发食物链的崩溃。

9·Many will die off with the first frost whilst others hibernate until the following spring.

很多会在初霜之时死去，其他的则会蛰伏到来年春天。

10·When birds began to die off, People began to criticize the use of chemical pesticides.

当鸟类开始相继死去时，人们就开始对使用化学杀虫剂提出批评。