例句與造句

1. In 1998, Mitchell Wand showed that adding a fexpr device to lambda calculus & mdash; a device that suppresses rewriting of operands & mdash; produces a formal system with a trivial equational theory, rendering it impossible to make source-to-source optimizations without a whole-program analysis.
2. It's difficult to find mitchell wand in a sentence. 用mitchell wand造句挺難的