Most of Ontario lake's water are brown, because of the

Dissolved organic matter

所有跟帖： 

• 啊？是不是Algae? 哈哈，居然會英文表達，我越發能蒙人了，其實是和花董學的： -beautifulwind- ♀ (188 bytes) () 03/19/2021 postreply 15:02:59