On the beach giant kelp had washed ashore.沙滩上有随浪冲上来的大海藻.The soil washed from the hills is silting up the hydroelectric dams.从山上冲刷下来的泥土就要让水电大坝淤塞了。The collar comes off this shirt and can be washed separately.这件衬衫的领子可以拿下来分别...
这一组中包括黄酮类化合物, 二苯甲酮 、 一些香豆素 、 木质素 、 缩合单宁和芪.The group includes flavonoids, benzophenones, some coumarins, lignans, condensed tannins, and stilbenes.木质素是次生壁成份的特征.Lignin is a characteristic component of secondary walls.橡木酒桶神...