This is the ruler [with that] you can draw a straight line.
③这就是那把尺子，您可以用它划一条直线。
This is a book. That is a ruler.
这是一本书。那是一把尺。
一把尺子就是我所需要的。
Thiss is the ruler [that] you can draw a straight line [with the ruler].
这就是那把尺子，您可以用它划一条直线。
那是一把尺子。
This ruler is a little longer than that one.
这把尺子比那把长一点儿。
This ruler is a little longer than that one.
这把尺子比那把长一点儿。
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