第二类酶的另一种切割方式是在同一位置上切割双链，产生平末端，简称平端。这种平端可以通过DNA连接酶连接起来。
建立了平端光纤与锥端微透镜光纤对耦合的理论模型，得到耦合系数的计算公式。
The coupling between butt fiber and cone lensed fiber is described in this paper. A theoretical model is presented and the formula of coupling efficiency is given.
本文主要介绍如何在原有的承插管道芯模上通过技术改造生产平端管道，以及工艺改造带来的经济效益。
The article introduces how to produce flat end pipes on original plug pipe mandrel through technical modification and economic benefits.
近地球端是较平的低地。 然而在远地球端是山脉。
The near side has flat lowlands, while the far side is high and mountainous.
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