People or things that are reliable can be trusted to work well or to behave in the way that you want them to.
She was efficient and reliable.
她做事既高效又可靠。
Information that is reliable or that is from a reliable source is very likely to be correct.
There is no reliable information about civilian casualties.
还没有关于平民伤亡的可靠信息。
It's very difficult to give a reliable estimate.
做出可靠的估计很困难。
We have reliable sources.
我们有可靠的消息来源。