waterwings

常见例句

• The children use waterwings to keep themselves up in the water while they're learning to swim.
  孩子们在学游泳时常用浮圈使自己浮在水面。
• Bed Evolution Analysis for Shiping-Yumenkou Section Waterw ay of Yellow River North Main Stream
  黄河北干流石坪至禹门口段航道河床演变分析
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