In biosafety laboratories and clean rooms, the over headlighting should be consisted of closed units fixed direct to or recessed in ceiling.
在生物安全实验室和洁净室，顶灯应该有密封装置直接固定在天花板上或嵌入在天花板内。
2
He stopped and turned his head quickly, his poppy-cheeked face lighting up.
他停了下来，迅速地转过头去，有着深红脸颊的脸上露出喜色。
3
While "taking up photography" might sound like a great idea now, but when you find out you need to wake before the sun and head out at dusk just to get the best lighting, you might not be as excited.