以al为后缀的单词是什么词性

　　Basal metabolism is much lower for creatures in cold water.

　　冷水中生物的基础代谢速度要低很多。

　　Side shoots should be cut back to one leaf above the basal cluster.

　　应将旁枝剪至主串上一叶高处

　　Regular exercise can increase your basal metabolic rate

　　定期动能够提高你的基础代谢率。

　　Using computers has a beneficial effect on children's learning.

　　使用计算机对孩子们的学习有益。

　　An aptitude for computing is beneficial for students taking this degree.

　　计算才能对于攻读这个学位的学生有益处。