三的单词是three. 例句 They have three small children. 他们有三个年幼的孩子。 The baby is three months old. 这婴儿三个月大了。 The town is three ...
he must后面加动词原形。 例句 On hills, he must use low gears. 在山上，他必须用低速挡。 He must have put on several kilos. 他体重一定增加了好几公...
