If you turn the envelope upside down, the key will fall out.
你如果把信封倒过来，钥匙就会掉出。
As she picked up the envelope, a key dropped out.
她拾起信封时，一把钥匙掉了出来。
The key to the church door is inside this envelope.
教堂的门钥匙在这个信封里面。
As he picked up the envelope, a key dropped out.
他拣起信封时，一把钥匙掉了出来。
As he picked up the envelope, a key dropped out.
他拣起信封时，一把钥匙掉了出来。
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