例句與造句

1. The advantages of GEMs, compared to multiwire proportional chambers, include : ease of manufacturing, since large-area GEMs can in principle be mass-produced, while wire chambers require labor-intensive and error-prone assembly; flexible geometry, both for the GEM and the readout pads; and suppression of positive ions, which was a source of field distortions in time-projection chambers operated at high rates.
2. It's difficult to find source of field in a sentence. 用source of field造句挺難的