To stop or keep from happening.

防止；使不发生。

To hinder, obstruct, or impede.

阻挠；阻碍；制止。

To go or arrive before.

【古】先行或先到达。

To prevent is to stop or keep from happening.

Prevent 指阻止或使不发生：

To hinder is to prevent, but usually only for a time; the idea of delay is present in this work.

Hinder 指暂时阻止，有延滞之意：

Obstruct means to place something in the way of accomplishment; it is often applied to the checking of important actions.

Obstruct 指放置障碍物使之不利进行，常指制止重要之举动而言：