若心不专一就会一无所获，要想求全就学得不精，一心二用就会学不明白。意在强调专心致志和“术业有专攻”的重要性，只有专注于自己的志业，不好高骛远，才能有所成。

"I find people confusing. This is for two main reasons. The first is that people do a lot of talking without using any words."

选择不够精当，叙述不够详尽

塑料的真正成本不在于生产，而在于它的后续处理。