Some engineering problems, especially those involving fluid free surface, are nonlinear in boundary conditions.

其中不少问题是非线性的，如带自由面的流动区域，边界条件即呈非线性。

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The free amino acids in the cystic fluid of Cysticercus cellulosae were studied.

研究了猪囊虫囊液中的游离氨基酸。

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So it's not entirely impossible that free-floating planets have hot cores, cold surfaces, and an intermediate layer, where water could exist in some fluid form.

所以，存在一种可能，不受约束的漫游星有炙热的内核，寒冷的表层，和一个特别的中间层，在那水是液态的。

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Its purpose is to promote free trade and the fluid movement of goods, peoples, and currency.

CENTERFORSECURITYPOLICY: The uncertain future of Mercosur

Famous for his tactile and sensual fluid forms, he takes his inspiration from nature to create an organic minimalism that he calls "fat free" design.

CNN: Biography: Ross Lovegrove