51、明枪易躲，暗箭难防。
Clear guns are easy to hide, but hidden arrows are difficult to defend.
52、虚假的朋友比公开的敌人更坏。
False friends are worse than open enemies.
53、选择朋友要审慎，摒弃更要审又慎。
Choose friends with caution, abandon them with caution.
