单词：expressions
n expression without words
n the communication (in speech or writing) of your beliefs or opinions
n a word or phrase that particular people use in particular situations
n the style of expressing yourself
n a group of symbols that make a mathematical statement
n (genetics) the process of expressing a gene
n a group of words that form a constituent of a sentence and are considered as a single unit
n the act of forcing something out by squeezing or pressing
expressions的用法和样例：
例句
- The expressions developed are based on Stoker's law.各种展开的计算公式是根据斯托克斯定律推导出的。
- Write a program that uses stack postponement to evaluate the following expressions.用一个堆栈后进先出的程序来求得下面的公式。
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