I pron. the person who is speaking 我（用做句子的主语）
ice n. solid frozen water 冰，冰块(不可数名词，表示“若干冰块”可用单位
量词，如：three blocks of ice；与数词连用表示“若干份”冰淇淋)
Three ices，please！即：Three ice-creams，please！
break the ice，打破沉默
idea n. a picture in the mind 主意，构想( idea 之后可接of, about或
for + doing sth.)
have no idea = not understand，后接of .that 分句或wh- 分句
idiom n. a phrase which means something different from the meanings of
the separate words 习语, 成语, 惯用语
idiomatic，adj.
idiomatically adv.
if conj. 1.如果，倘若，假如，是否
