conifers are only one kind, as a whole. Therefore, the spiral arrangement is not likely to be the result of a direct adaptation to wind pollination.

• 文章首段老观点讲风媒植物大造花粉弥补损失，第二段开始做了转折，不过作者并没有完全否定老观点，只是认为它很不全面，并且做了重大补充。