【正确答案】：
IDIOMS ARE EXPRESSIONS THAT ARE NOT READILY UNDERSTANDABLE FROM THEIR LITERAL MEANINGS OF INDIVIDUAL ELEMENTS.
【题目解析】：习语是指从单个元素的字面意义上不容易理解的词或语句。
IDIOMS ARE EXPRESSIONS THAT ARE NOT READILY UNDERSTANDABLE FROM THEIR LITERAL MEANINGS OF INDIVIDUAL ELEMENTS.