1.drop one's guard 丧失警惕
Since I cannot predict in advance when the opponent will drop their guard, I don't even attempt to coordinate my breathing with the attack.
因为我不能事先预测对手何时会放松警惕,甚至我也不能使自己的呼吸与进攻相协调。
2.attempt an attack 发起攻击
An adversary is anyone who might attempt an attack against another party.
对手是可能发起攻击的任何人。
3.on the alert 警惕
Often on the alert, she checks once but twice in the event...
她总是警惕着,一个事情上检查了一遍又一遍。