For Special Attention
pull tight = pull something tight is to pull it until it is tight — 把某物拉紧，就是一直拉直到它绷紧。
head of the bed / foot of the bed = when you lie on a bed, you put your head near the head of the bed and your feet near the foot of the bed — 躺在床上时，头靠近床头（head of the bed），脚靠近床尾（foot of the bed）。
pillow case = a pillow goes inside a pillowcase — 枕头放在枕套里面。
fitted sheet = the corners of a fitted sheet are made to fit over the corners of a mattress. Fitted sheets are used only as bottom sheets, not as top sheets. — 松紧床单的四角按床垫四角缝制，只能当底单用，不能当顶单。
smooth out = you smooth out a sheet by removing wrinkles — 抚平床单就是把褶皱弄平。
