They called for a show of hands.

他们要求举手表决。

Can I see a show of hands?

举一下手让我看看好吗？

Can I have a show of hands, please?

请大家举手表决好吗？

The issue was decided by a show of hands.

这件事是通过举手表决决定的。

Thee issue was decided by a show of hands.

这件事是通过举手表决决定的。