这句话有没有更好的说法

As the core of a team, a leader usually contributes most to achieve their common goal.

Being the leader of a group, most of the contribution in achieving a common goal shall fall on this role due to its deserved responsibility within.

这句已经写的很好了

楼上的，越改越差了

A leader,the core of a team, usually contributes most to achieve their common goal.