一般用英语怎么表达

Other amenities, less commonly available, include a library and exercise room

还有一些不太常有的设施，包括图书馆和健身房。

Grey-market perfumes and toiletries are now commonly sold by mail.

水货香水和化妆品现在常常通过邮购方式售卖。

Obsessional personalities commonly ruminate excessively about death.

有强迫症的人通常过多地思考死亡的问题。

Leagues are commonly made for mutual defense.

结成联盟往往是为了共同防御。

When men are most sure and arrogant, they are commonly most mistaken.

人们过于自信和过于傲慢之时也正是他们最易犯错之日。