1. 滑轮组：black body radiation 黑体辐射 | block and tackle 滑轮组 | block diagram 方框图
2. 滑车组：block-and-tackle 复滑车 | block-and-tackle 滑车组 | block-bottom bag 层叠底袋
3. 滑轮和复滑轮组：anchorage 停泊 | block and tackle 滑轮和复滑轮组 | boat 船只
4. 滑轮：blobber-lipped 嘴唇厚而突出的 | block and tackle 滑轮 | block caprtal 大写印刷字体