If the leaf aging, hardening or occurrence crackle, should be replaced immediately.

若叶片老化、硬化或者出现裂纹，就应及时更换。

youdao

If the leaf aging, hardening or occurrence crackle, should be replaced immediately.

若叶片老化、硬化或者出现裂纹，就应及时更换。

youdao