Working in materials usually not considered appropriate for high-end products, the finishedpieces are often a bit 'rough around the edges' (literally speaking).
通常不被认为适合于高端产品的材料工作，完成的作品往往有点'粗糙周围的边缘“(从字面上讲)。”
2
Now if they were able to learn quickly and memorize at the same time, they will be performing and making music with all their finishedpieces the rest of their lives!
只要他们能够很快学会新曲目同时把曲子背下来，就能在漫长的人生中完整地用这些曲子弹奏出动人的音乐。
3
4：When I finished, I had two pieces left over and I'd already thrown away the poop sheet that tells where they go. But the funny thing is the bike seems to work okay without them.