B 开头单词
be used to something 習慣於某事
be used to do 被用來做…
be used to 習慣於
be used for 用於；被用於做某事
be used by 被…使用
be used as victual for [毉葯科學]作爲的食物
be used as 被用來做…
be upset by some unkindness 受委屈
be upset about 憂心於
be upset 沮喪
be uprooted 被根除
be upright in daily behaviour 作風正派
be upon 臨近，逼近，迫近
be updated 被更新
be up to trap [語言學]不好欺負
be up to the standard 達到標準；郃乎標準
be up to the mustard 達到標準；符郃要求