Partial or all of the text content may have been taken from one or more of the following sources. We have done our best to maintain the text as-is without any changes. We also make sure no profit is made from this. 

此处的部分或全部的文字内容可能来自以下的一个或多个来源。我们已尽力保证保持原作文字不变。我们也确保不从此牟利。

-Singapore Primary Chinese Textbook

-Singapore Secondary Chinese Textbook