英文關鍵字
adult
assistance
assisting
biologist
casual
caucasian
cheerful
clothing
college
communication
computer
connection
conversation
day
desk
education
electronic
eyeglasses
female
helping
indoors
knowledge
laptop
learning
library
male
man
mature
people
professional
professor
sitting
student
studying
table
talking
teacher
technology
two
university
using
wireless
woman
young