book-endingBNC²³⁶²¹³⁺¹ 基本例句 书靠；书立；书挡连续剧的开篇和结局亦作bookends；分两部分播放的电视广告；在…作首尾穿插 A long- term graph of the Vix hints at cyclicality, with periods of great choppiness in the early and late1990s book-ending an era of relative calm in the middle of the decade. Vix的长期图像也暗示着周期性，1990s的早期和末期呈现大量的波浪，夹在中间的90年代中期却是一段相对平静的时期。 ecocn