顶封头的英文

• cover head

• 封:    close; seal
• 头:    5点就得动身 have to start before ...
• 顶封:    closed top; closed-top; over seal
• 封头:    capped end; closure head; end capped; end enclosure; end plate cover; head plate; seal head
• 浮顶封:    float roof seal; floating roof seal