检察员掏出手帕，擦了擦眉头。The Inspector took out a handker-chief and mopped his brow.他掏出一块手帕，擤了擤鼻子。He took out a handkerchief and blew his nose.还好我买了很多手帕。It's a good thing I brought lots of handkerchiefs....
The center of inscribed circle of tetrahedron is called incenter.四面体内切球的球心称为四面体的内心。We can now use tetrahedron and hexahedron elements in three - dimensional stress analysis.我们现在在三维应力分析中采用四面体单元和六面体单元.Each tetrahedron shar...