Just as a snowflake requires a nucleus to spur the formation of its intricate crystal structure - a catalyst was required to spur the formation of the desired community.

一片雪花，必须有凝结核才能形成其复杂的晶体结构。在我们期望建立的群体中，同样需要这样的催化剂。

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The formation mechanism of transition part shoal, function and arrangement of spur dike and training dike are expounded and living examples are given for explanation.

对过渡段浅滩形成的机理，丁、顺坝的作用和布置等方面进行论述，并以整治实例予以说明。

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There is a difference, though: Unlike angel tax credits, which haven't proved to spur business formation, lower income taxes would create more opportunities for angel investors, so the overall level of investment might rise.

WSJ: Do Angel Investors Deserve Tax Credits to Invest in Small Businesses?

In general, is a differential between cap gains taxes and personal income and corporate rates a spur to capital formation and entrepreneurship?

FORBES: Shoot At Schwarzman, Hit You