downwash gradient洗: distinct; clear梯度: gradient; grad对流梯度: convection gradient; convective gradient河流梯度比: channel gradient ratio自动对流梯度: autoconvection gradient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:洗流梯度,即可在微信中查询翻译