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I don't think limits.

The discovery of topological insulators has opened up a new frontier in condensed matter physics, where the interplay between topology and symmetry leads to novel quantum states of matter.

如果不給兒童提供幫助，如果忽視他的環境，那他的精神生命將會處于持續的危險之中。

The best way to learn a new programming language is by writing programs in it.

當機會來臨時，就要行動。