船水线上部被油等污染的痕迹的英文

watermark

• 船:    boat; ship; vessel ...
• 水线:    waterline; shoreli ...
• 上部:    headpiece; ridge
• 被:    quilt
• 油:    oil; fat; grease
• 等:    class; grade; rank
• 污染:    pollute; contamina ...
• 的:    4次方是 The fourth po ...
• 痕迹:    mark; vestige; imp ...