Under nature conditions of growth and development, plants were invariably exposed to different environmental stress, which had profound effects on crop production.
植物总是处于环境胁迫之中，它们严重影响着观赏植物的生长发育。
The process of maize growth and development under ecological conditions was significantly different.
不同播种期条件下，玉米生育进程表现较大差异。
Often maintain indoor air fresh bird-flu is normal growth and development one of the important conditions.
经常保持室内空气新鲜是雏鸡正常生长发育的重要条件之一。
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