His theory is perfectly sound.
他的理论完全正确。
He seemed to me perfectly sound and able.
在我看来，他是十分精明能干的。
His reasoning is perfectly sound, but he misses the point.
他的推理完全正确，但是未切中肯綮。
Electronic video - audio software blenches the sound and picture perfectly .
电子视听软件集声画于一体，因此不同于一般的写作。
When you can play it perfectly, then concentrate on the sound that you are making.
当你能完美演绎这首曲子之后，再去把注意力集中到音色上！
Both are perfectly correct and sound perfectly natural in this example, so use either or both.
两句都完全正确，听上去很非常自然，随便哪句都行。
Both are perfectly correct and sound perfectly natural in this example, so use either or both.
两句都完全正确，听上去很非常自然，随便哪句都行。
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