这位拳击冠军深晓拳击中投机取巧的所有窍门，他知道很多伤害对手并使其乱阵脚的方法。 The champion knows all the tricks of the boxing trade; he knows many ways to hurt his opponent and to get him mixed up.
窍门就在於瞄准时须屏住呼吸。 The trick is to hold your breath while you aim.
锁这门要有窍门，得用些时间才能学会。 There's a knack in/to locking this door which takes a while to master.