《史记·七十列传·酷吏列传》
张汤因为懂得观察君王的喜怒哀乐而投其所好，皇上与他上下配合，当时屡次辩论国家大事的得失，国家他而得到益处。
张汤以知阴阳，人主与俱上下，时数辩当否，国家赖其便。
Zhang Tang was able to infer the emperor's joy, anger, sorrow and happiness and curry favor with him. The emperor and he worked in tandem, debating the gains and losses of major national events at the time and the country benefited from him.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 张汤以知阴阳，人主与俱上下，时数辩当否，国家赖其便。 [/INST] Zhang Tang was able to infer the emperor's joy, anger, sorrow and happiness and curry favor with him. The emperor and he worked in tandem, debating the gains and losses of major national events at the time and the country benefited from him.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 张汤以知阴阳，人主与俱上下，时数辩当否，国家赖其便。
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Zhang Tang was able to infer the emperor's joy, anger, sorrow and happiness and curry favor with him. The emperor and he worked in tandem, debating the gains and losses of major national events at the time and the country benefited from him.
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