flatmate：
n.合住公寓套间者;同公寓房客
复数： flatmates
记忆技巧：flat 公寓 + mate 人 → 合住一套公寓的人
例句：
I have this quid pro quo with my flatmate where I do his washing for him and he lets me use his computer for an hour a day.
我与我舍友做了一个交换协议：我帮他洗衣服，他把他的电脑让我用一小时。
You didn't return her calls, so she called your roomie, who panicked and called me.
你没有回她的电话，所以她打给你的室友，你的室友慌了，然后又打给我
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