...就可以在玛丽安表演时帮助她。”Mr Titterton is chairman of the Omega Ensemble but has been
the group’s official page turner for the past four years. His job is to sit
beside the pianist and turn the pages of the score so the musician doesn’t have
to break the flow of sound by doing...
An average of just 15 cm of rainfall
last year has made it the driest year since 1850.各位老师好，请问：1.这个句子中为什么用an average of，而不用the average of呢？2.请问an average of和the average of用法有什么区别呢？
3.我查找的时候发现有人说an
av...