走着走着，他突然停了下来，让男孩拔掉一株幼小植物。
While walking, he suddenly stopped and told the boy to pull out a small plant.
图1显示在封闭瓶内的幼小植物。
幼小植物没有足够大的叶面积进行高效率的光合作用，而较老植物又趋于衰老。
Very young plants do not have sufficient leaf area to carry out high rates of photosynthesis, while older plants are subject to senescence.
应用推荐