糟糕的是树熊似乎可以永远闭气。
Unfortunately, it seems that koalas can hold their breath indefinitely.
当然，有经验的使用者通常会选择关闭气球。
Of course, experienced users would usually keep balloon help off.
请闭气一下！
文中结合闭气装置工作环境，对火箭发动机的闭气装置性能进行了分析。
In this paper obturator performance of rocket engine is analyzed according to work environment.
文中结合闭气装置工作环境，对火箭发动机的闭气装置性能进行了分析。
In this paper obturator performance of rocket engine is analyzed according to work environment.
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