这套公式涉及了等节距锯链和不等节距锯链两种情况，还涉及星形驱动链轮、轮辋式驱动链轮和星形导向链轮三种链轮。

The formulas concern two kind of saw chains with same pitch and different pitch and three kind of sprockets, which are rim sprocket, spur sprocket and nose sprocket.

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现在你有供应链管理和管理使命导向的M.S.（理科硕士）学位，现在有骨骼和牙科的生物考古学的理科硕士学位和学习与思考的M.A. 学位（文学硕士）。

Now, you have the M.S. in supply chain management, and in managing mission-driven organizations. There’s an M.S. in skeletal and dental bioarchaeology, and an M.A. in learning and thinking.

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具有良好目标导向的高效率的价值链必将成为企业竞争的巨大优势。

Efficient value chains with proper goal orientation will certainly provide companies great competitive advantages.

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