This means that teams with KERS have less ballast to move around the car and hence have less freedom to vary their car's weight distribution.
这就是说使用KERS的车队使用了更少的压舱物来移动赛车，因此有较少的自由来改变他们的车的重量分配。
2
The use of KERS is not compulsory.
KERS的使用是非强制性的。
3
Ferrari said that the technology of its HY-KERS experimental vehicle, developed by its racing division, could reduce its cars' emissions by 35 per cent.