本段的结尾句提出了结论性观点，既呼应了主题句内容，又与扩展句紧密关联，并且承上启下地引出后面段落的主题。

Eskimos are expert at fishing and hunting. Eskimos know the habits of each animal living in the northern lands. They know that a seal swimming under the ice will keep a breathing hole open by its warm breath, so they will wait beside the hole and kill it. Eskimos fish in the rivers, and when the sea is frozen, they cut holes in the ice and lower fishing lines into the water.

本段没有结尾句。

Idleness is the root of all evils.——懒惰是万恶之源。