解释：往往在你觉得是轻而易举的时候，困难也就跟着来了。

我只是一个唱歌跳舞的人。

Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.

Every seed planted is a promise to the future.

The core competitiveness of the aquaculture industry lies in technological innovation and sustainable development.

最优财政政策要求税率随时间平稳变化，仅对政府支出的永久性变化作出反应。