人工智能的挑战不仅仅是构建能够执行任务的系统，而是构建能够学会执行任务的系统。

The function of the writer is not to solve the problem but to state the problem correctly.

Every piece of plastic we recover and recycle is a step toward a cleaner planet.

有机世界的发展是根据基于物质构成及其固有力量的不可变规律进行的。