Nigrometer
黑度计
🗣️ 情景例句
Table tennis, I suppose. That's almost our national game. People from all walks play it.
我想应该是乒乓球吧。它几乎是全国性运动，各行各业的人都打。
The roof has leaks in it,and the front step need to be fixed.
房顶有漏缝，并且前面台阶需要修理。
It was the idea of supporting a craft on a 'pad',or cushion, of low-pressure air, ringed with a curtain of higher pressure air.
用一个气垫来支撑船体，低压空或软垫，软垫周围用高压空气环绕。