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- 知已知彼，百战不殆。 He who has a thorough knowledge of the enemy and himself is bound to win in all battles.
- 知彼知已，胜乃不殆； Know your enemy, know yourself, and your victory will not be threatened.
- 已知 known
- 已知的 known
- “知彼知已”等于是了解本身相对于敌人的强处和弱点（在商业环境中，敌人就是竞争对手）。 "Know your enemy, know yourself" is tantamount to knowing one's strengths and weaknesses relative to those whom we are fighting against (e.g. the competitors, in the case of business).
- 知彼知己者，百战不殆； He who has a thorough knowledge of the enemy and himself is bound to win in all battles.
- 已知条件 known conditions
- 现已知与未知之事间的距离极大。 The gap between the now knowable and unknowable is vast.
- 另外,老爸还是我的一个十分要好的知已朋友呢! The secus, old daddy is still my a full to be good friends with of know already friend!
- 她一直是他姐姐的知已，又是他母亲忠实的客人。 She had been his older sister's friend, and his mother's faithful visitor.
- 已知半径为四英尺,求周长。 The given radius being 4 ft., find the circumference.
- 【谚】患难识知已。 A friend in need is a friend in indeed.
- 已知数 known number
- 视为知已 look upon
- 这个国家缺少已知的煤矿矿床。 The country is short of known deposits of coal.
- [谚]患难识知已。 A friend in need is a friend in indeed.
- 现在周期表包括人类已知的全部元素，这些元素按适当的顺序排列起来。 The periodic table now contains all the elements known to man arranged in their proper sequence.
- 知已健康管理 health management
- 这事被认为是已知事实。 It is taken as a given.
- 士为知已者死 the scholar dies for his bosom friend
