短语讲解：

1. The scientists reported that about 1,500 bones have been recovered from the cave.

recover from 从…收回[取回]; 恢复，痊愈
例句：It took a long time for him to recover from a bad cold.
他患重感冒,很长时间才康复。

2. They said the bones come from at least 15 individuals.

come from 来自
例句：Ambient noise may come from any direction.
外界噪声可以来自任意方向。
at least 至少
例句：For that day at least he lost heart.
至少这一天他是垂头丧气的。

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