The linesink drainage element method was proposed to solve the problem that small FEM grid was needed near drainage holes due to the high hydraulic gradient at the cost of time consuming.
I also had to exert a mild mental push against gravity if I wanted to keep an object moving in a straight horizontal line; otherwise it would sink vertically.
同时如果我想让一个物体平移,我还要克服重力的作用,否则它就会垂直下沉。
3
Its members do not camp in your front yard or line up to brush their teeth over your bathroom sink.