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)。
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。
Cleaning Device (9) (10) (11) ensures the cleaning of liquid supply unit.
清洗装置(9)(10)(11)保证了供液体单元的清洗。
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