沉积盆地中流体压力在地质历史中是变化的，所以很难确定压力对油气生成、有机质成熟作用的影响。

It is difficult to confirm the pressure effect on oil and gas generation and organic matter maturation, because the fluid pressure in sedimentary basins changes during geological history.

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为实现树木长期与原种一致的无性繁殖，必须了解其成熟作用和幼态保持的机理，选取幼态组织作为繁殖材料或采用人工复壮措施。

So it is essential to study the mechanisms of maturation, juvenility retention and rejuvenation before uniform, true-to-type, long-term cloning of trees can be achieved.

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