In approach number one, you simply lay out the various positions, pro and con, and the professor strives to remain neutral; sort of not tip his hand about what he holds.

方法一，你们简单的列出不同的观点，正面和反面，老师争取保持中立;,不表明他支持哪边。

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"It is not in his best interest to tip his hand right now, " she said.

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"Sometimes it's better not to practice and just to play, " said Julien, careful not to tip his hand.

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While the ECB left its interest rates unchanged, Draghi may tip his hand on any future monetary policy changes at his press briefing.

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