pre-,在前，早于，预先，set,设置。

1. You can preset the radiators to come on when you need them to.

你可以预先调好暖气，使它在你需要的时候启动。

2. Bake the cake in a preset oven.

在预先设置好的烤箱中烤蛋糕。

3. Ring counters should be always preset because without presetting their operation is undermined.

环形计数器必须进行预置,否则其工作状态是不正确的.

4. The menu will expand to show four preset positions and preset 1 will automatically be highlighted.

此菜单会展开显示四个预置位置,预置1将自动变高亮.

5. But it failed to enter a preset orbit following its launch.

但这颗通信卫星最终未能进入预定轨道.