But reading and writing files in unit tests slows tests and requires adding more complexity (like creating a temp directory and cleaning up files after use).
但在单元测试中读和写文件会减缓测试，增加更多的复杂性(如创建临时目录和在使用后清除文件)。
2
Could be the laser unit itself and cleaning might not do anything.
可能是激光发射器本身和清洁可能不会做任何事情。
3
Cleaning Device (9) (10) (11) ensures the cleaning of liquid supply unit.