The reason is, that with every push

The reason is, that with every pusher stroke only a narrow strip of blank sreen area is offered for filtration.

Results (Chinese Traditional) 1:

原因是，每個推杆行程只狹長的空白屏地區提供過濾。

Results (Chinese Traditional) 2:

其原因是，與每一位推行程只有空白篩網面積的窄條供過濾。

Results (Chinese Traditional) 3:

原因是，在每一個推杆行程只有一條很窄的空白荧幕面積提供過濾。