In today's culture, there are many forms of expression available other than novels and poems.
在今天的文化中， 除了小说和诗歌之外， 还有许多可用的表达形式。
英语百科
Available expression
In the field of compiler optimizations, available expressions is an analysis algorithm that determines for each point in the program the set of expressions that need not be recomputed. Those expressions are said to be available at such a point. To be available on a program point, the operands of the expression should not be modified on any path from the occurrence of that expression to the program point.