1) It's understandable that you're a few minutes late. The traffic is horrible today.
2) 例子: It's totally understandable that you didn't reply in time. There must have been many issues to be dealt with urgently towards the end of the construction.
场景: 项目快竣工验收了,现场工程师需要处理的问题很多,经常没时间回复。
3) perfectly/ totally ~