Seeing this view of both the water's placid surface and the creatures lurking below makes me feel like a swimmer at the surface with my legs dangling below.

观看平静水面和潜伏在下面的动物，使我感觉到我像是一个在水面上游泳者，而腿却在水下晃来晃去。

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Start with the simple push-off drill, in which the swimmer pushes off and stays in the streamline position until they pop to the surface and stop moving forward.

从简单的有力的游泳练习，游泳运动员结束划水时，停留在流线型姿势直到他们流行于表面，停止前进。

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A high dive will make a swimmer go deeper upon entry and therefore, the swimmer will cover more vertical distance to get to the surface. Covering that extra distance costs time.

高度过高的出发跳水会导致入水过深，因此，游泳运动员到达水面的垂直距离会更长，滑过这段额外的距离也就更费时。

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The anonymous swimmer then brought Ms Frankcom to the surface and got her on board a boat.

BBC: A Great White Shark

The deck of some boats, such as the Taunton, a 228-foot Danish steamer built in 1902, lie just 10 feet below the surface, an easy duck dive for even an average swimmer.

BBC: Wreck diving in Bermuda

In an active drowning, a swimmer is at or below eye level at the surface of the water for about 10 to 20 seconds.

CNN: Water safety expert: 'Drowning doesn't just happen'