英文關鍵字
active
activity
adult
adults
aged
alone
attentively
bad
call
caucasian
cellphone
communication
concentration
crisis
depression
disappointed
domestic
elderly
grandfather
home
hopeless
interlocutor
leisure
life
lifestyle
listening
listens
male
man
mobile
negative
old
only
pension
pensioner
phone
portrait
problem
retired
retirement
sad
senior
seniors
serious
smart
smartphone
social
standing
stress
talk
talking
technology
telephone
test
thinking
unhappy
upset
using
while
window
wireless
years