downward mobility趋: hasten; hurry along下流: lower reaches动: harness cause disorder stir ...地下流动: subsurface flow向下流动: downflow; downward flow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:趋下流动趋下流动,即可在微信中查询翻译