Translation of "Smallest" in Chinese

The smallest child knows such a simple thing.

這麼簡單的東西三歲小孩也會。

Mercury is the smallest planet in our solar system.

水星是我們的太陽系中最小的行星。

Mercury is the smallest of the eight planets in the Solar System.

水星是太陽系八大行星中最小的。

The best wealth is knowledge, average wealth is children, and the smallest wealth is material objects.

最好的财富是知识，一般的财富是孩子，最小的财富是物质。