有呀~既是可數(shù)[C]又是不可數(shù)[U]
補(bǔ)充：一般都是用不可數(shù)的,很少用可數(shù)的.
people's diet是選不可數(shù)的diet的意思.人們的飲食.
diet
n.
1.飲食,食物[C][U]
Their diet chiefly consists of grain and vegetables.
他們的飲食主要是谷類和蔬菜.
2.(適合某種疾病的)特種飲食[C]
No chocolate,please.I'm on a diet.
請不要放巧克力,我在節(jié)食.
vt.
1.給(病人)指定飲食
vi.
1.進(jìn)規(guī)定的飲食;忌食;節(jié)食
She is dieting to lose weight.
她在節(jié)食以減肥.