The sentry had orders to shoot on sight.

哨兵奉命一发现有动静就立即开枪.

The guard had orders to shoot on sight.

哨兵奉命见对象就开枪。

The sentry was ordered to shoot on sight.

哨兵奉命一发现目标就射击.

Though protected by law within the park, they are fair game outside. Ranchers place large bounties on pumas, and will shoot on sight.

虽然在公园内有法律保护，但是在公园外面，几率是平等的。牧场工人给美洲狮很大的诱饵，然后可以在视野范围内射击。