Leave the valve protection cap in place until the cylinder has been secured in place and is ready to be used.

让阀门保护帽一直留在原位，直到钢瓶已经固定好，并准备使用。

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Leave the valve protection cap in place until the cylinder has been secured in place and is ready to be used.

让阀门保护帽一直留在原位，直到钢瓶已经固定好，并准备使用。

youdao