exchanging water hole换: exchange; barter; trade水孔: waterstoma换水: changing the waer; changing the water排水孔;去水孔: drain hole定期换水: refreshing the water periodically下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:换水孔,即可在微信中查询翻译