词汇	山圈
释义	山圈 shān quān丛山环抱的地方。
随便看	expansion in powers expansionin series expansion in series expansion insert expansion installation expansion instrument expansion in Taylor series expansion intensity index expansion interface expansion in terms of eigenfunction expansion into continued fraction expansion into powerseries expansion into power-series expansion investment expansion investments expansion in vitro expansion I/O expansionism expansionisms expansion isothermal expansionist business plans expansionistic expansionistic pricing expansionist measures expansionist policies