quadvt.用空铅填abbr.四边形（=quadrangle)abbr.四组；四胞胎之一（=quadruplet)abbr.四声道的（=quadraphonic）abbr.四头肌（=quadriceps）abbr.空铅；铅块（=quadrat）n.四方院子；四胞胎之一；嵌条；成套的四件东西quadrifoil四叶的

1. The secondary hydrocarbon generation controlled the intensity of gas generation and determined the superior conditions of accumulation and conservation of coalbed methane as well.
   二次生烃作用不仅制约着生烃强度，同时决定了煤层气优越的富集和保存条件。