n.底盘
He walked in , bold as brass, wearing nothing but his underpants.
他走了进来, 只穿一条衬裤,极为厚颜无耻.
She was dressed only in a vest and underpants.
她只穿了一件汗衫和一条短裤.
While the bath was filling, he padded about in his underpants.
往浴缸里放水时,他穿着内裤走来走去。