Teaching model is the medium of teaching: theory and practice.

教学模式是教学理论和实践的中介。

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Criticism is an important medium of theory and practice.

批评是理论与实践的重要中介。

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But without finding evidence of a medium-size hole, it was a tough theory to prove.

但是没有发现中型黑洞的证据，这是一个要加以证明的棘手理论。

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But without finding evidence of a medium-size hole, it was a tough theory to prove.

但是没有发现中型黑洞的证据，这是一个要加以证明的棘手理论。

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