On trial, the chimney still can work normally in six-grade wind force, so the safety wind-proof cap efficiently insures the personal safety of indoor operating staff.
经试验在有六级风力时，烟囱仍可正常工作，从而有效地保障了室内操作人员的人身安全。
On trial, the chimney still can work normally in six-grade wind force, so the safety wind-proof cap efficiently insures the personal safety of indoor operating staff.
经试验在有六级风力时，烟囱仍可正常工作，从而有效地保障了室内操作人员的人身安全。
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