·2,447,543篇论文数据，部分数据来源于NoteExpress
Once you are on the surface, the main unit for propulsion are your arms, so it is very important that your draw the right pattern underwater, and that is a hourglass pattern.
身体浮到水面后，最大的推进力量就来自手臂。因此正确的水下划水路线非常重要，也就是沙漏状划水。
youdao
应用推荐
模块上移
模块下移
不移动