他的感谢信听起来很生硬，充满了不自然的表达。
His thank-you letter sounded awkward with ___stilted expressions.
他的致辞使用了大量矫揉造作的词汇，听起来很不自然。
His speech was filled with ___stilted phrases that sounded unnatural.
他的演讲充满了矫揉造作的词句，听起来很不自然。
His presentation was filled with ___stilted expressions that sounded awkward.
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