To select the improved varieties of Tung trees is a main approach to prevent the breed from degenerating.
油桐选优去劣是防止品种退化、实现油桐良种化的主要途径。
The Gramineae and Cyperaceae were Locustae's main host. The Dicotyledon could be temporary host, however , it was bad for Locustae to grow up, breed and so on.
飞蝗嗜食寄主为禾本科、莎草科植物，双子叶植物可以成为飞蝗的临时寄主，但对飞蝗的发育、繁殖及后代均有明显的不利影响；
It is believed that the main competence of an enterprise is its culture. Many successful corporations try their best to breed advanced culture so as to always stand at the foreland of the market.
企业文化是企业核心竞争力的主要构成部分，成功的企业总是着力打造先进的企业文化，以便能始终站在市场竞争的前沿。
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