为了保护南极的生态环境，到南极考察的科学工作者不仅要把塑料等难以降解的垃圾带离南极，还要把粪便等生活垃圾带离南极，这是因为南极（    ）

    There are lots of animals on the earth. What is the biggest animal of all? The whale (鲸) is. A blue whale weighs more than a hundred tons(吨). Whales live in the sea, but they are not fish. They are mammals(哺乳动物) and must have air to breathe(呼吸). The babies drink milk from the mother's body. Every spring, groups of whales swim hundreds of kilometers to warm places.

    Each group goes to the same place every year. The mothers take very good care of their babies. Whales are a gentle kind of giant(温顺的庞然大物). They always live together and help each other. They “talk” to each other in the water with high noise that sounds like singing.

    Yet people kill over a hundred whales a day. They kill them to make many things. The whale dies very slowly an in great pain(疼痛). Some ships kill every whale they can find, even mother whales and babies. If things go on like this, there will be no young whales growing up and no mother whales having more young whales (产下幼仔).

他的一番话，使我非常感动。____，____，在不确定中生活的人，能____，会____。在不确定中，深化了____，就能____，努力生长。

上述一段话是作者跟种树人谈话后的____，借____喻____，蕴含了深刻的生活哲理。