"his responsibilities were a constant strain" "the mental strain of staying alert hour after hour was too much for him"
nervous strain是什么意思
nervous temperament是什么意思
nervous smile是什么意思
top-class是什么意思
black look是什么意思
unacceptable behavior是什么意思
nuclear umbrella是什么意思
gamp是什么意思
off-the-wall是什么意思
great height是什么意思