怎么用英语尽可能浅显地解释"understand"这个词?

know something clearly

understand
v.

理解；懂得知道和了解…的性质和重要性；理解
See: apprehend
To know thoroughly by close contact or long experience with:
熟知，通晓通过密切接触或长期体验完全知道：
That teacher understands children.
那位教师了解孩子
To grasp or comprehend the meaning intended or expressed by (another):
获知，理解理解或懂得由（另一人）想的或表达的意思：
They have trouble with English, but I can understand them.
他们对学英语有困难，但我能理解他们
To comprehend the language, sounds, form, or symbols of.
理解理解语言、声音、形式和符号
To know and be tolerant or sympathetic toward:
谅解知道和对…能忍耐或同情：
I can understand your point of view even though I disagree with it.
即使我不同意你的观点但我能谅解
To learn indirectly, as by hearsay:
得知，听说间接获悉，如通过道听途说：
I understand his departure was unexpected.
我听说他的离开是出人意料的
To infer:
推断，猜想：
Am I to understand you are staying the night?
我猜你晚上留下，对吗?
To accept (something) as an agreed fact:
认为理所当然，不言而喻作为同意的事实接