chassis
n
(pl unchanged 复数不变) framework on which the body and working parts of a vehicle, radio or television are built (车辆的)底盘, 车架; (收音机或电视机的)底盘, 框架. =>illus at App 1 见附录1之插图, page xii.
You were very kind. You brought out all your jewellery and you told me I could take anything I wanted. There were so many beautiful things that it was hard to choose. And then I saw a lovely diamond necklace with a big blue stone in the centre.