抽油机具有双链条同步驱动换向机构，可实现增距式柔性换向；
The Pumping unit has a double-chain synchronous driving and reverse mechanism, and can realize flexible reverse with stroke increment;
后来我才想到，当时应该用我的1.4X的增距镜（1.4x extender），不仅能再减弱一挡光线，还能离太阳更近些。
I didn't think of it until afterwards, but I could have put the 1.4x extender on which would have cut out another stop of light and got me closer to the sun.
目的：总结应用颅内外联合径路手术矫正7例重度先天性眶距增宽症的方法和效果。
Objective To conclude the reconstruct method and therapy results of orbital hypertelorism by combined intracranial-extracranial approach in 7 cases.
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