We can't take any chances. 我们不能冒任何风险. Why take chances? 何必冒险呢?
Always expect the unexpected. 要随时戒备意外的发生. An ounce of prevention is worth a pound of cure. 一分预防, 胜过十分之治疗. There's safety in numbers. 人多势众. Don't get so friendly with the competition. Play your cards close to your vest. 不要跟你的对手太友善, 当心别人刺探机密. Watch your mouth. The walls have ears 说话当心点儿, 别忘了隔墙有耳.
