化学是一门研究物质性质及其变化的科学。
Of all the means which wisdom acquires to ensure happiness throughout the whole of life, by far the most important is friendship.
运气不好时金子可能变成铁,运气到来时铁也可能变成金。
You can't be that kid standing at the top of the waterslide, overthinking it. You have to go down the chute.