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His theory is perfectly sound.是什么意思？

His theory is perfectly sound.

他的理论完全正确。

相关词汇
his theory is perfectly sound

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

theory

n. 学说，理论，原理，推测；

is

vt.& vi. 是（be的三单形式；n. 存在；

perfectly

adv. 完美地，理想地，完全地，无瑕疵地；

sound

n. 声音，声响，音调，声调，声波，嘈杂声；vi. 响，发声，听起来，好像，回响，[音乐]乐器等被奏响；vt. 使出声，使发声，清楚地发出，宣布，发表，颂扬；adj. 健全的，合理的，完好的，无损的，明智的；adv. 彻底地，充分地；
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