前进的动力Forward momentum

猩猩教育孩子：你不能左脚踩上一条船，右脚踩上另一条船，如果你脚踩两头，就会失去前进的动力。

Orangutans educate children: You can't step on a boat with your left foot and step on another boat with your right foot. If you step on both ends, you will lose the motivation to move forward.