初中学段属于普通教育的基础阶段，高中学段是普通教育的提高阶段。
Junior middle stage is the basis of general education, while senior high stage is the general improvement.
这些阶段有更大的热免疫力由于其较高的质量，直径较大的轴承提高阶段的刚度。
These stages have greater thermal immunity due to their higher mass, and larger diameter bearings increase the stiffness of the stage.
计算结果表明：人工压裂不仅可以提高阶段采出程度，同时也可增加最终可采储量。
The calculated results show that artificial fracturing may increase not only the recovery percentage at a stage but also the final recoverable reserves.
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