dì qiàn
意思解释：（Rift valley）至少两个断层之间的地壳下降部分，一般长度宽度大得多。
(1)壕沟。如“天堑”。《史记·高祖本纪》:“郎中郑忠乃说止汉王，使高垒深～，勿与战。”(2)挖壕沟。《左传·昭公十七年》:“环而～之，及泉。”…
(1) entrenchment. Be like natural moat . history the great-great-grandfather that write down · this discipline : Song of exterminate of V of coat Shao elder brother is touched buy and Zhi of Liao of of of Sui of Bi of haw of acyl dirty be good at! 2) digs trench. is the left clear that pass · fair seventeen years : of of of of full model ! Thin
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