The summations of forces in this and that directions must be zero.在这个和那个方向上的合力必定为零.Summations are almost invariably indicated ellipses instead of the more prevalent sigma notation.在表示“连加”的式子中,几乎一成不变地使用省略号来代替更为流行的“∑”符号....
The bridge deck will be partly constructed in antimagnetic material.驾驶甲板部分结构应该是防磁材料.Some eccentric constructed an electric brassiere warmer.某个怪人制造了一种电子保暖胸罩.It was a good table too, sturdily constructed of elm.这也是张很不错的桌子，...