The second reason isn't as obvious. According to Salo, "the outer silicone cap better maintains the shape and does not wrinkle as much, thereby causing less drag."

第二层原因就不是那么明显了，萨洛表示，“外层的硅胶泳帽一般不会起皱，能够更好地保持表面平滑度，减少在水中的阻力。”

youdao

The second reason isn't as obvious. According to Salo, "the outer silicone cap better maintains the shape and does not wrinkle as much, thereby causing less drag."

第二层原因就不是那么明显了，萨洛表示，“外层的硅胶泳帽一般不会起皱，能够更好地保持表面平滑度，减少在水中的阻力。”

youdao