敌人实力雄厚，则须时刻戒备它；
The enemy strength is abundant, then must alert it frequently;
一张好的人像照片要捕捉真实的表情或不戒备的时刻，而这样的瞬间只有当一个人放开心情忘记镜头存在的时候才会出现。
A good portrait captures a genuine expression or an unguarded moment, and these typically come only when someone is having a great time and forgets about the camera.
这就好比一个战士处于战场中，时刻需要保持高度戒备状态一样。
This is like a soldier in the battlefield, always the same need to maintain a high state of alert.
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