B 开头单词
be used to something 习惯于某事
be used to do 被用来做…
be used to 习惯于
be used for 用于；被用于做某事
be used by 被…使用
be used as victual for [医药科学]作为的食物
be used as 被用来做…
be upset by some unkindness 受委屈
be upset about 忧心于
be upset 沮丧
be uprooted 被根除
be upright in daily behaviour 作风正派
be upon 临近，逼近，迫近
be updated 被更新
be up to trap [语言学]不好欺负
be up to the standard 达到标准；合乎标准
be up to the mustard 达到标准；符合要求