这和开灯类似，不懂电的人，会去试灯泡而不知道去打开开关，所以灯不会亮。
It is like turning on an electric lamp. A person who does not know about electricity will try at the bulb instead of the switch, so the lamp does not light.
选用灯具时应该在拍摄之前试一试，看看哪种灯适合你的摄影机和拍摄环境。
As always, experiment before the shoot to see what works best for your camera and situation.
本文阐述和介绍了微波硫灯的特性和优点，并试从对微波硫灯的工作机理剖析，提出了研制微波硫灯的主要技术关键和解决途径。
The advantages and characteristics of microwave sulfur lamps (MSL) have been introduced in detail. By analysing the mechanism of MSL the key technology of manufacturing have also been discussed.
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