Porpoises and sharks are natural enemies.
海豚和鲨鱼是天然仇敌。
Porpoises and sharks are natural enemies.
海豚和鲨鱼是一对天敌。
Porpoises and sharks are natural enemies.
海豚在孩子们面前跳舞。
The porpoises have not gone away ever since.
从那时起，这些鼠海豚就没有离开过。
The porpoises have not gone away long since.
从那以后很久了，这些鼠海豚都没有离开过。
I wondered that the porpoises had long since gone away.
我感到十分惊奇，那些海豚早就离开了。
I wondered that the porpoises had not long since gone away.
我感到十分惊奇，那些海豚不久前才离开。
I wondered that the porpoises had not long since gone away.
我感到十分惊奇，那些海豚不久前才离开。
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