3. 注重逻辑性、科学性、专业性

准确翻译科技英语的关键，在于透彻地理解原文，注重科技语篇的逻辑性、科学性及专业性。因此仅仅掌握了单个词的词义，和常用结构的翻译还是很不够的。事实证明，应用中的科技英语句式常常远比ー些常用结构复杂而多变。这就要求我们翻译时，要避免将原文进行字面意义的串朕、拼凑或主观臆断，要透彻地分析句子的深层结构，积极了解相关的专业知识，使译文既要有逻辑性与科学性，又要符合专业要求，力求做到文理通顺，准确地、有效地表达出原文的内容。

* Morpholoaically and anatomically the leaf is the most variable plant organ. The collective term for all the types of leaves appearing on plants is the phyllome (Arber, 1950). The different phyllomes of the Spermatophyta are extremely variable both in external and in internal structure and in function. Because of this variability the following types of phyllomes have been classified: foliage leaces, cataphylls, hypsophylls, cotyledons, and others. The foliage leaves are the principal photosyn- thetic organs. The cataphylls are the scales that appear on buds and on underground stems and their function is protection or the storage of reserve materials. The first, lowermost leaves of a side branch are termed prophylls; in monocotyledons only one prophyll is usually present and in dicotyledons, two. The hypsophyffs are the various types of bracts that accompany the flowers and their function is, apparently, protection. Sometimes the hypsophylls are coloured and then their function is similar to that of petals. The cotyledons are the first leaves of the plant. The floral organs are also considered as leaves.

在形态学上和解剖学上，叶是变化最大的植物器官。长在植物上的所有类型的叶的集合术语为叶性器官。种子植物门的不同叶性器官在外部形态、内部结构和功能上都是非常不同的。由于这种变化性，叶性器官分为下列几种类型：营养叶、低出叶、高出叶、子叶和其他类型。营养叶是重要的光合器官。低出叶是着生在芽和地下茎上的鳞片，而且它们的功能是保护或贮存预备物质。首先，位于侧枝最下方的叶叫先出叶，在单子叶植物中通常只有一片先出叶，而在双子叶植物中为两片。高出叶是指与花相伴而生的各种类型的苞片。很明显它们是起保护作用的。有时高出叶是有色的，因此它们的功能与花瓣相似。子叶是植物最早出现的叶子。花器官也被当作叶子看待。

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