I've been busy building the mini kossel 3d printer on and off for about a year now.

我一直忙于建设微型科塞尔3d打印机和关闭了大约一年了。

youdao

I've been busy building the mini kossel 3d printer on and off for about a year now.

我一直忙于建设微型科塞尔3d打印机和关闭了大约一年了。

youdao