Seaweeds are any of numerous marine algae,such as a kelp,rockweed,or gulfweed.

海指任一种海生类，如大型褐、或马尾。

Kelp is rich in vitamins and trace elements.

大型褐富含维他命和微量元素。

The article studied the extracting method of fucoidin from kelp and influences of factors on its free radical scavenging activity.

海带为原料提取褐糖胶,并初步研究了一些因素对褐糖胶的自由基清除能力的影响。