身体位置

151.身体中线：center[medium」line of the body

152.躯干位置：trunk position

153.身体平衡：body balance

154.浮力：buoyancy

155.浮出水面：surface

156.浮在水面：keep afloat

157.浸入水中：submerge

158.下沉：drop; sink

159.水面线（蛙泳中头的位置）：waterline

160.俯卧姿势：face down; prone position

161.仰卧姿势：back floating position

162.俯卧漂游姿势：prone float

163.流线型姿势：streamlined position

164.低头：drop the head

165.弓背[身] ：arch the back

166.时起时伏（在水中）：ducking; undulation

167.滑行：glide