两者合力，要让用户的社交网络成为他们所有网络活动的中心。
Together, they aim to put Facebook users' social networks at the center of all they do online.
当流体开始流动时，阀瓣在作用在密封表面中心的合力(F)作用下开启。
As flow begins, the plates open in response to a resultant force (f) which ACTS as the center of the sealed surface area.
研究任意开口薄壁截面杆的剪力流和弯曲中心坐标的计算问题，利用合力矩定理导出计算公式，给出算例。
This paper examines the shearing flow of any thin-walled beam with open section and the calculation of the coordinates of bending center.
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