根据短文内容，完成任务。

      My name is Chen Lan. My home is in Gulangyu. Where is Gulangyu, do you know? It is in Xiamen. It is near the sea (海). Gulangyu is a small place(地方), but it is very nice and clean. There are no cars, buses or bikes. People only walk. So it is very quiet (安静的). My house is in the center of Gulangyu. Behind my house there is a big old tree. My grandfather tells me the tree is very old. There are many birds in the tree. We call it a “bird tree”. My house is near the sea. The sea is big and blue. There are many fish in the sea. After school, I often go there and catch fish with my friends. It is very interesting. I like eating and catching fish.

-- Are the keys in your hand?

-- Yes, _______.

顾炎武在《日知录》中说：“孰知今日之清谈，有甚于前代者？昔之清谈谈老庄，今之清谈谈孔孟。……不习六艺之文，不考百王之典，不宗当代之务，举夫子论学论政之大端一切不问……以明心见性之空言，代修己治人之实学。股肱惰而万事荒，爪牙亡而四国乱，神州荡覆，宗社丘墟。”这段论述表明顾炎武

《十二铜表法》中规定“债权人可将无力偿还的债务人，交付法庭判决，直到将其戴上足枷、手铐，甚至杀死或卖之为奴。”这主要体现了罗马法中哪一项基本原则（　）