玻璃对不同颜色的光的折射量不同。Glass bends light of different colours by different amounts.光通过棱镜时产生折射。Light is refracted when passed through a prism.钻石折射出的金色光芒令他着迷。The light reflected off the stone, creating a golden glow he found entr...
信号工要确保井筒内无人,才能发送升降信号.Signal worker can't send hoisting signal until be ensure that no worker is in it.人员通行,必须通知信号工和卷扬工.It must be advised signal worker and winch operator when personnel is passing by....