Computer security experts have cautioned that an Internet worm which infected millions of computers around the world may target PC users with a new variation on April 1.
电脑安全专家近日提醒大家，一种曾在全球入侵数百万台电脑的蠕虫病毒，可能于今年愚人节变种袭击个人电脑用户。
In 1984, natural variation plants were selected from man-made disease garden. Through directional screening the early-maturing and disease-resistant new variety-Laomian 15 came into the world in 1993.
1984年从人工病圃中选择自然变异株，经过多年连续定向筛选，于1993年育成特早熟抗病棉花新品种辽棉15号。
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