Definition: the mind and mental abilities Level: B1
我无法入睡，因为这个问题一直在我脑海里盘旋。
I couldn't sleep because the problem was going round in my ___head.
一个绝妙的主意突然冒了出来。
A brilliant idea suddenly popped into my ___head.
然后那个想法突然出现在我脑海中。
Then suddenly the idea came into my ___head.
