Butterfly spring valves are important safety attachments of boiler pressure vessels, they are used to prevent system pressure from exceeding allowable limit value.
蝶形弹簧安全阀是锅炉压力容器的重要安全附件，用于防止系统压力超过允许的极限值。
Happiness is the prairie in spring, seeing a spring idea full of life, the butterfly dances.
幸福是在春天的原野，看春意盎然，蝶舞翩跹。
And all birds are singing loud, there, the first white butterfly in the sun goes flitting to spring!
鸟儿们全都在高声唱歌，第一只蝴蝶一闪而过飞向春天的怀抱！
The utility model comprises two butterfly wing-shaped base boards, a book clamp with a spring, a clamp rod grate, two clamp springs and two motion clamp rods.
由两个蝴蝶翅膀形底板、一个带弹簧书夹子、一个卡棍箅子、两个卡簧和两根活动卡棍组成。
I like spring , because spring's cat can run , spring'sflower can open , spring's grass very green, bee and butterfly can fly in the sky.
我喜欢春天，因为春天的猫能跑，春天的花儿会开，春天的草很绿，蜜蜂和蝴蝶在天空中飞翔。
I like spring , because spring's cat can run , spring'sflower can open , spring's grass very green, bee and butterfly can fly in the sky.
我喜欢春天，因为春天的猫能跑，春天的花儿会开，春天的草很绿，蜜蜂和蝴蝶在天空中飞翔。
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