They offer tips on topics such as home safety.他们就家居安全等问题提供建议。He could feel his fingers growing numb at their tips.他能感到指尖正在变得麻木。His fingers poked through the worn tips of his gloves.他的手指从手套的破指尖处露了出来。...
一把测径规a pair of callipers因此,线偏振光径全反射后将变成椭圆偏振光.Linearly polarized light will in consequence become elliptically polarized on total reflection.冲刷是指流动中的水将任何粒径的土壤冲走的现象.Scour is the removal of material of any size by flowing w...