slewing
['slu:ɪŋ]
n.
快速定向，快速瞄准;
v.
（尤指在协议或建议中）规定，约定，讲明（条件等）( stipulate的过去式和过去分词 );
例句:
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Slewing bearings are basic components widely used in construction machinery industry.
回转支承是工程机械行业的重要基础件.
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It is used for the crane slewing bearing.
这是用于起重机的回转支承.
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The single - row four point contact ball slewing ring is composed of two seatring.
单排四点接触球式回转支承,由两个座圈组成,结构紧凑、量轻、球与圆弧滚道四点接触,能同时承受轴向力、向力和倾翻力矩.