Easy to raise and lower head by handwheel.
容易饲养和降低手轮头.
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Waterline on head is above goggle line on free and lower head on back.
自时水线在泳镜上线;仰时在较低处.
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Old Waterline on head is above goggle line on free and lower head on back.
老:自时水线在泳镜上线;仰时在较低处.
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