Ying-Hao Liang says to 《除霜工程師—NJ》 https://3.bp.blogspot.com/-PbbMK-F_Eb8/WdiTYbEzoHI/AAAAAAAAwm0/AhNGcMWYSzE0leAD5y90aCzbsKHmX0yzACLcBGAs/s1600/17_drain_clot.jpg
