在过去，攀登者的选择很有限，一条11毫米的单绳，9毫米的半绳以及8毫米双绳。
In the past, climbers had limited choices - a 11mm single, a 9mm half and 8mm twins.
我喜欢由550伞绳编成的拉链拉手，但我不喜欢单绳结的式样，我喜欢双绳结式的，更短些，而且能防止钩挂和扭曲打结。
Although I do like 550 cord zipper pulls I'm starting to dislike the long single knot style in favor of shorter 2 knot styles to prevent snagging and cord rotation.
它具有双贝壳，分别由两根绳控制进行相对运动，还有用来排水的微型泵（他仍在寻找蛤足的最佳设计方案）。
It has a bivalve shell, two strings which move the valves against one another, and a small pump that expels water (he is still working on the best design for the foot).
针对交流双滚筒单绳缠绕式提升机在多水平运行时，中间水平没有电气制动的问题，提出改造方案。
Directing to the problem of ac double-drum single rope winding lifter working in multiple level without electric brake in middle level, put forward the reform plan.
目的对比自体腘绳肌腱和同种异体半腱肌腱双束重建前十字韧带的初期临床疗效。
Objective to compare the primary clinical results of double-bundle anterior cruciate ligament reconstruction (ACLR) with hamstring tendon autografts versus semitendinosus allografts.
目的：观察关节镜下采用自体腘绳肌腱双束重建前交叉韧带的临床疗效。
OBJECTIVE: to evaluate the clinical curative effects of arthroscopic reconstruction of anterior cruciate ligament using autologous hamstring tendons in a double-bundle technique.
目的：观察关节镜下采用自体腘绳肌腱双束重建前交叉韧带的临床疗效。
OBJECTIVE: to evaluate the clinical curative effects of arthroscopic reconstruction of anterior cruciate ligament using autologous hamstring tendons in a double-bundle technique.
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