“合理使用”的英文是Reasonable use。同样意思的英文还有fair dealing、fair use。
例句：合理使用浮点BASIC语言和6502汇编语言，使该系统既有一定的测控速度，又有友好的用户界面。
We also reasonably use the Float BASIC and 6502 Assembler Language to ensure the system with both higher measuring speed and friendly user interface.
