如果对提出来的问题确实不了解、不知道，可以说老实话，必要时事后提供书面的答复。
If you have no idea how to answer the question, say you don't know and, if necessary, promise to provide a written response afterwards.
我对贵重物品不了解，所以也不知道它值不值。
I don't know about this expensive stuff, so I don't know whether it's worth it or not.
小的时候，我总把父母对自己的爱当作天经地义，因为我不了解，也不知道父母的辛苦。
Small, I always love their parents as a matter of course, because I do not understand the hard work their parents do not know.
小的时候，我总把父母对自己的爱当作天经地义，因为我不了解，也不知道父母的辛苦。
Small, I always love their parents as a matter of course, because I do not understand the hard work their parents do not know.
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