严肃学习 4 / Learning Process 4
从喷气的角度，瞄准有待改善。面部表情严
肃，显示良好的学习意愿。
From the nozzle discharge angle, the aim seems to need
improvement. The serious facial expression indicate a
desire to learn.
开
s
前奏 / Prelude
-1-
-2-
-3-
严肃学习 / Learning process
-4-
-5-
-6-
-7-
-8-
娴熟阶段 / On the fly
