composite hard metal base contacts

例句：

1. 1. The new car is made of a composite material that is lighter and stronger than steel.
   这款新车是由一种比钢铁更轻、更强的复合材料制成的。
2. 2.The scientist used a composite material to make the robot's arm more durable.
   科学家使用了一种复合材料来使机器人的手臂更加耐用。
3. 3.The construction company uses composite materials in their building projects to reduce weight and increase strength.
   建筑公司在其建筑项目中使用复合材料以减轻重量并增加强度。