The security mechanism behind the two pairs of keys is called the Open Authentication (OAuth) protocol (see Resources).
两对密钥背后的安全机制被称为开放式验证（OAuth）协议（见 参考资料）。
The five pairs of salivary glands open into the mouth.
有五对唾液腺通向口腔。
The basic thought is that the shaking force complete balancing of planar linkage is reduced to the mass moment substitution of two pairs link and planar open chains.
其基本思路是利用质量矩替代将平面连杆机构摆动力完全平衡问题，简化为二副构件的质量矩替代和平面开链的摆动力完全平衡问题。
Please open your books and turn to page 9. Look at part C and work in pairs.
请把书翻到第九页，看C部分，同桌开始练习对话吧。
Please open your books and turn to page 9. Look at part C and work in pairs.
请把书翻到第九页，看C部分，同桌开始练习对话吧。
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