Researchers at home and abroad have found that the English past tense can only be acquired at a later stage in the developmental pattern.
国内外研究者大量的研究表明一般过去式通常难以被二语学习者习得。
The investigation of the mechanism of pattern formation has been a central topic of developmental biology for a long time.
对模式形成的机制的探讨一直是发育生物学的中心课题。
Almost from its inception it follows a developmental pattern sharply divergent from that of the zygote.
它几乎一开始就遵循与合子显然不同的发育模式。
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