The first of these, the most common sort of female portrait in the Renaissance, presents the sitter as a beautiful and desirable woman who, true to type, smiles at the viewer.

首先来说，文艺复兴时期的最为常见的女性肖像画的形式是表现出被画者女性的美丽和吸引力，而且无一例外地面向观众做出微笑。

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So it is essential to study the mechanisms of maturation, juvenility retention and rejuvenation before uniform, true-to-type, long-term cloning of trees can be achieved.

为实现树木长期与原种一致的无性繁殖，必须了解其成熟作用和幼态保持的机理，选取幼态组织作为繁殖材料或采用人工复壮措施。

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So it is essential to study the mechanisms of maturation, juvenility retention and rejuvenation before uniform, true-to-type, long-term cloning of trees can be achieved.

为实现树木长期与原种一致的无性繁殖，必须了解其成熟作用和幼态保持的机理，选取幼态组织作为繁殖材料或采用人工复壮措施。

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