The puma immediately ran away when people saw it.改成 （ ），it immediately ran away.a.Having been observedb.On being observed
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b.On being observed On ... 和 when ... ,意思都一样，“当。。。的时候”。On being observed ，一被人看到，puma 就跑掉。 ：）
The puma immediately ran away when people saw it.改成 （ ），it immediately ran away.a.Having been observedb.On being observed
b.On being observed On ... 和 when ... ,意思都一样，“当。。。的时候”。On being observed ，一被人看到，puma 就跑掉。 ：）