Hydrometer: An instrument used for measuring the specific gravity of a liquid or solution.

比重计：量度液体或溶液的比重的仪器。

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Exact solution of a statistical model for laser beam scattering from diffusing surface has been obtained, the comparison with the approximation of center of gravity has been made.

本文对激光束在漫射表面上散射的一类统计模型给出了严格解，并与“质心近似”所得结果作了比较。

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This paper makes a comprehensive and systematic study of the establishment of the earth's ellipsoidal gravity model and the solution of the boundary value problem under ellipsoidal boundary.

本文全面、系统的研究了地球重力场椭球谐模型的建立和边值问题在椭球界面下的求解情况。

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Problems whose gravity is enough to produce near consensus among the population cannot seem to find a solution in Congress.

CNN: How strong, really, is America?