Collecting stamps must be great fun!
集邮一定是很有趣的事！
It must be great fun to fly to the moon in a spaceship.
乘宇宙飞船飞往月球一定很有趣。
I suggest that it must be a great fun to be with children all the day.
我认为这必须是整天和孩子们带来很大的乐趣。
I suggest that it must be a great fun to be with children all the day.
我认为这必须是整天和孩子们带来很大的乐趣。
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