That's why MESSENGER is loaded with instruments to determine the surface composition.
这就是为什么信使装着工具，以确定它的表面组成。
Surface porosity, surface composition and surface tension are all relevant factors.
表面孔率、面组分及表面张力也都是相关因素。
Surface porosity, surface composition and surface tension are all relevant factors.
表面孔率、面组分及表面张力也都是相关因素。
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