由于刚到这所城市的大的高中，我对理查德了解不多，只知道他很积极，每个人都喜欢他，其中包括我的老板，这所高中的校长。
Relatively new to this large urban high school, I knew little of Richard, except that he was active and well liked by everyone including my boss, the directing principal.
他的哥哥不长进，虽然我对他家了解不多，可是从他的语气我看得出，他哥哥根本不理他父母的生活，在外面像个无业流氓一样。
His older brother is not motivated and I can learn from his statements that his brother leaves his parents alone and lives like a jobless hooligan.
他似乎很满意我对机器操作的叙述，可是我却如履薄冰，因为我自己对那机器实在了解得不多。
He seemed satisfied with my description of how the machine works, but I was on thin ice because I don't really know much about it myself.
他对我的情况了解得不多。
他对我的情况了解得不多。
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