守侯

例句：

1. 1. The guards were posted at the gate to keep an eye on the intruders.
   守卫们站在门口监视入侵者。
2. 2. She was waiting for her friend who promised to meet her at the bus stop.
   她正在等她的一个朋友，他答应在公交车站见面。
3. 3. The old man kept a watchful eye on his grandson, ensuring he stayed safe.
   老人警惕地盯着他的孙子，确保他安全。