101．As the water that collects in the bottom of the nest evaporates，the water vapor rises and is heatedby the incubating bird，which adds significant humidity to the incubation environment．

(as从句)

当聚集在巢底的水蒸发时，水蒸气上升并被正在孵卵的鸟加热，于是为孵化环境增加了较大的湿度。

分句1：As the water that collects in thebottom of the nest evaporates

分句2：the water vapor rises

分句3：the water vapor is heated by theincubating bird

分句4：which adds significant humidity tothe incubation environment．

2和3并列

1和2，3并列，1是2，3的条件

4和1，2，3嵌套，非限定性从句引导词which代表1，2，3