If prolusion is improved and streamline is not, then a swimmer will go faster.
If prolusion is improved and streamline is not, then a swimmer will go faster.
如果推进力改善而流线型没有改善，那游泳运动员会游的更快。
If prolusion is improved and streamline is not, then a swimmer will go faster.
如果推进力改善而流线型没有改善，那游泳运动员会游的更快。