当我们观察每一株种子植物时,首先映入眼帘的是那些美丽的花朵、累累的果实以及翡翠般的绿叶。这些花、果、叶为什么能舒展在空中,接受阳光的照射与雨露的滋润,经受得住狂风暴雨的袭击呢?那正是因为有茎的支持。茎不仅支撑着植株的地上部分,还具有运输、贮藏和繁殖的功能。茎是如何完成这么巨大的使命呢?还是让我们先从它的构造谈起吧。 When we look at each of the seed plants, the first thing that catches your eyes is the beautiful flowers, the fruit and the emerald green leaves. Why can these flowers, fruits and leaves stretch in the sky, exposed to sunshine and rain, withstand the storm? It is because of the support of the stems. The stems support not only the aerial parts of the plants, but also transport, storage and reproduction functions. How does the stem accomplish such a huge mission? Or let’s start with its construction.