---高频词组----
have…to do with
without doubt (=undoubtedly) [color=#1E90FF] in doubt (=in a condition of uncertainty)
be due to
come off duty
go on duty
be on duty
be in duty bound to (do) (=be required by one’s job or esp. by conscience)
be eager for
by ear (=play music from memory without having seen it printed)
have an ear for (=have keen recognition of sounds esp. in music and language)
a word in one’s ear
on earth
with ease ( = easily) at (one’s) ease ( = without worry or nervousness)
put sb. at his her ease (=free sb. from worry or nervousness)
economize on (=save sth. instead of being wasteful)
have an effect on
be in effect (=be in operation)
请大家写下中文解释^_^
