Of all the economically important plants,palms have been the

the least 做状语修饰study表示程度,最少被研究的
再问： 能把the least放到studied后面吗？have been studied the least
再答： 也可以啊。 例如。I very much like him I like him very much。 不改变句子意思。
再问： ok谢啦~！