The harmonic screw type valve is driven by the double wave harmonic screw. It can transform circle movement to line movement for the closing and opening of the valve.

谐波螺旋式阀门采用双波谐波螺旋传动，实现由圆周运动向直线运动的转化，实现阀门的启闭。

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The math model on out-moving jaw crusher mechanism of changing length link with high-joint is established by using closing-vector-circle method.

采用封闭矢量环法推导建立含有高副的变长连杆的外动颚式破碎机构的数学模型。

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The Knitting Circle is currently touring English theatres, closing in Bristol's Tobacco Factory on 20 May.

BBC: Ouch

No doubt, for Dohrn the unapologetic terrorist, teaching a course on the Palestinian terror war against Israel is like closing a circle.

CENTERFORSECURITYPOLICY: Terror training grounds

Dean is merely closing the circle and banking that his full-service model will push individual acts to draw the attention of musical venture capitalists as backers, shifting the risk of signing an up-and-coming act from the record label to outside investors.

FORBES: Swizz Beatz's Uncle Relaunching Ruff Ryders With Unusual Business Plan