When these animals died of old age, he always buried them carefully.
当这些动物老死后，他就细心地把它们埋葬。
This kind of animals has already died out.
这类动物已经绝种。
Throughout Earth's history, thousands of species of species of animals have died out.
贯穿地球的历史，成千上万的物种已经灭绝。
Many sea animals have been sick and have died.
许多海洋生物生病死亡。
Many sea animals have been sick and have died.
许多海洋生物生病死亡。
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