包含多篇精心编写、英文短文，每篇都配有教学背景、核心语法要点和词汇解析。 <img data-key="0" src="http://imagev2.xmcdn.com/storages/ccb8-audiofreehighqps/36/F8/GAqhF9kMoUPKACF5wwQR3tkd.png!op_type=4&device_type=ios&upload_type=attachment&name=mobile_large" alt="" data-origin="http://imagev2.xmcdn.com/storages/ccb8-audiofreehighqps/36/F8/GAqhF9kMoUPKACF5wwQR3tkd.png?op_type=0" data-large="http://imagev2.xmcdn.com/storages/ccb8-audiofreehighqps/36/F8/GAqhF9kMoUPKACF5wwQR3tkd.png!op_type=4&device_type=ios&upload_type=attachment&name=mobile_large" data-large-width="750" data-large-height="500" data-preview="http://imagev2.xmcdn.com/storages/ccb8-audiofreehighqps/36/F8/GAqhF9kMoUPKACF5wwQR
