could be可能是;有可能
could have本能够;本来也可以
1.it could be a virus, or it could be all in the mind.
这可能是种病毒,或者可能全是凭空想像。
2.sorry? could you repeat the question?
你说什么?能不能把你的问题再说一遍?
3.could we meet at lunchtime?
我们能在午餐时间见个面吗?
4.scientists warned that emergency cooling systems could fail and a reactor meltdown could occur.
科学家们警告说紧急冷却系统可能失灵,核反应堆的堆芯熔毁可能会发生。
5.if you could mobilize the resources, you could get it done.
如果你能调动资源,你就能完成它。
6.nobody could predict the outcome.
谁也无法预料结果如何。