flown动词fly的过去分词flown.流动；涨潮；流；流量vi.流动；涌出；飘动；流畅vt.淹没flow label流标签flow field流场flow sheetn.流程图；作业图；生产过程图解flow tract流道flow trend径流趋势flow route工艺程序线flow laver流层flow state流态Flow fiela流场flow units流动单元

1. As the plates separate, hot molten mantle material flows up to fill the void.
   随着板块的分开，炽热的熔融地幔物质向上流动，以填充空隙。
2. But black upward mobility consists largely of people from poor families moving up.
   但是黑人在社会阶层上的向上流动大多都限于摆脱贫困的状态。