vigilant

形容词

1. 1

   警觉的、警戒的、提防的

   Parents should stay vigilant about what their children see online.

   家长应该对孩子在网路上看到的内容保持警觉。

2. 2

   严密监控的、密切注意的

   The guards remained vigilant throughout the long night shift.

   警卫在漫长的夜班中始终密切注意四周。