The compass is an instrument of navigation.

罗盘是导航仪器。

The needle of a compass points to the north.

罗盘的指针指向北方。

The best-known example is the compass plant of the prairies (Silphium laciniatum).

最著名的例子是大草原上的指向植（罗盘草）。

A compass needle always points north.

罗盘指针总是指向北方。