The two main schools of thought about speciation that emerged in the 20th century to fill this intellectual vacuum can be summed up as "breeding defined" and "niche defined".

20世纪出现的填补了这项学术空白的两大思想学派可被总结为“繁殖决定型”和“环境决定型”。

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A niche is a more narrowly defined customer group seeking a distinctive mix of benefits.

精致市场是更狭窄地根据所寻求的特别利益组合而界定顾客群体。

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In the bone marrow the most important elements of the niche appear to be osteoblasts, whilst a less defined population of fibroblasts regulates the maturation of immature t cells in the thymus.

骨髓中壁龛最重要的成分是成骨细胞，同时一类型成纤维细胞调控胸腺幼t淋巴细胞的成熟。

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None of this would benefit the bottom line if Bank of Granite had not carved out a narrow but well-defined niche.

ECONOMIST: Small banks in America

LensWork has grown for 20 consecutive years by exploiting a defined niche audience: fine art photography aficionados with a passion for classic black and white images that take their cues from the masters of the genre.

FORBES: How LensWork Leverages the Power of Niche

Once you have clearly defined your market niche, the next step is to develop winning strategies to ensure your success in China.

FORBES: The Secret of Succeeding in China