Its crucial part is intelligent controller, which controls bend and stretch of the knee joint of artificial leg as well as shank swing and often adopts fuzzy control strategy.

它的关键部件是控制人工腿膝关节屈伸运动及小腿摆动的智能控制器，其常常采用模糊控制策略。

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Charged particles called ions travel along the nanowire, causing it to stretch out in length and also bend and wiggle.

被称为离子的带电粒子沿着纳米线移动，导致它伸长、弯曲和摆动。

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The instructor made him shake his head, swing his arms, stretch his neck and bend his knees.

教练让他摇头，摆动手臂，伸展脖子，弯曲膝盖。

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Tobias Seidl at the University of Zurich says that's because nobody thought fast-moving ants were smart enough to bend and stretch their way under low-hanging obstacles without first slowing down to check them out.

NPR: Mole-Rats, Ants Making Science Headlines

"Bend, stretch and lift your legs" to ensure the garment doesn't ride up, she says.

WSJ: Pull On the Right Shapewear