A cross over at the front of the stroke tends to cause your elbow to drop, also damaging your catch and hurting your propulsion.
身前的划水过中线易于使你的肘部下沉,而且破坏你的抓水和损害你的动力。
2
At full reach and without dropping your elbow, feel like you are tipping your finger-tips over the front of a barrel (again flexing at the wrist), which will start the catch.