The challenge of creating efficient and selective catalysts keeps me motivated every day.

小说是一种反映世界的镜子。

如果时空穿梭是可能的，那从未来穿越回来的旅客在哪里呢？

Free vaccines are more valuable than expensive treatments, yet harder to promote.

投资者应避免基于情绪或市场炒作做出投资决策。