huì lèi ㄏㄨㄟˋ ㄌㄟˋ 汇类 谓汇总其类。 元 马祖常 《送简管勾序》：“平易以坦夷，和乐而静专，年弥久而情益真也，时益踬而义愈笃也，如斯而已矣。汇类而观之，古之君子入道之域者，亦由於是矣。”
相反那些被发现的碳类物质进入到地下使碳汇变成碳源。
The discovery reverses what was thought of as a carbon sink into a carbon source.
中央汇金公司的买进可能产生巨大影响，因为金融类公司是股市上规模最大的企业。
Huijin's buying is likely to have a significant impact, because financial stocks are the biggest companies on the market.
提出了求解含源汇项非定常对流扩散方程的一类高精度格式。
A high order accuracy compact difference method is presented for soling unsteady convection equation with source term.
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