[译] 我们把此线分为20个等份。
[误] Let's divide this line in 20 equal parts.

[正] Let's divide this line into 20 equal parts.
[注] divide sth. into...parts 意为"分为若干份"，又如：It divides into 2 separate parts. 它可分成2份。divide 与 half 连用须用介词 in，如：Divide the apple in half. 把这只苹果分成两半。