英文關鍵字
lesson;
2;
second;
two;
number;
instructions;
teach;
learn;
student;
course;
learning;
school;
video
clip;
animation;
cover;
starting;
3d;
rendering;
illustration
graphics;
blue;
moving;
banner;
internet;
smart;
job;
education;
design;
text;
concept;
symbol;
sign;
background;
business;
technology;
webinar;