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heat from the Sun是主语 can be conducted into是谓语 these materials是宾语 后面应该是 定语从句 应该有关系代词which have a significantly lower heat capacity 。。。
所以 我认为 这个地方 可能是 印刷错误 少了 一个 关系代词which或that.

During the day, heat from the Sun can be conducted into these materials have a significantly lower heat capacity because a vegetative blanket prevents heat from easily flowing into
and out of the ground.
你的句子肯定不对的。
应该在materials后加which，否则就是两个谓语了。
原文：
During the day, heat from the Sun can be conducted into these materials and stored—to be released at night. But in the countryside materials have a significantly lower heat capacity because a vegetative blanket prevents heat from easily flowing into and out of the ground.

确实奇怪
heat from the sun conducted into these materials have a significantly lower heat capcacity beacuse a vegetative blanket prevents heat from easily flowing into and out of the ground 才是正确的

文章错了，应该是
During the day, heat from the Sun can be conducted into these materials
and stored—to be released at night. But in the countryside materials
have a significantly lower heat capacity because a vegetative blanket
prevents heat from easily flowing into and out of the ground.

heat from the sun can be conducted into these materials 是主语从句 不影响后面的的主句啊

material （which/that) have