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1. The doctor explained the erection sequence to him.
医生向他解释了勃起顺序。
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2. This study aims to understand the erection sequence in men's sexual response.
这项研究旨在理解男性性行为中的勃起顺序。
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3. The patient was instructed to follow the erection sequence during intercourse.
患者被指示在性交过程中遵循勃起顺序。