... protective ring ==> 护环 protective screen ==> 保护屏蔽 protective sea wall ==> 护岸海堤墙 ...
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protective sea wall
防波堤
以上为机器翻译结果，长、整句建议使用 人工翻译 。
A sea current meter protective cap is characterized by being a drum-shaped cap, a cap wall is provided with two grooves, and the cap bottom is provided with two cone-shaped posts.
一种海流计保护帽，其特征是一圆桶形的帽，帽壁上开有两个槽，帽底有两根锥形的柱。
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