当节流阀进一步打开时，主喷口开始工作。
Further opening the throttle valve activated the main fuel jet.
夜里，埃塞俄比亚裂谷达纳基尔洼地，主火山喷口内活熔岩湖突破尔塔·阿雷火山部分破裂的硬壳闪闪发光。
Active lava lake inside the main caldera at night, glowing breaks through the thin and partially broken crust at Erta Ale volcano in the Danakil depression, Rift Valley, Ethiopia.
主要对均压环、弧触头、主触头、喷口等结构进行了优化及分析，分别进行了讨论。并且进行了综合优化。
The structures of the electric field shielding ring, arc contact, main contact and nozzle etc. have been optimized, analysed and discussed respectively, and they are optimized synthetically at last.
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