Since technicalpens often clog when used over waxy colored pencils, it is best to use felt-tipped and ordinary fountain pens.
因为手艺盖时常常梗塞啦糯彩色铅笔运用,最好用毡尖战一般盖。
2
The technical aspects of CHC cumulative theoretical basis and reliable experimental data, in the long-term operation of the wind tunnel laboratory, accumulating over 1000 pens detail data.