Roud then ventures a theory of his own: the custom, he argues, probably developed from a children’s game called Tig-touch-wood that was popular in early 19th century England.
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当制造成本降低，但大规模生产场景尚未成熟时，租赁可以帮助产品进入公众视野，完成市场教育。这对平台与厂家而言，是扩大装机量与测试场景的重要手段。
The Pixel Buds 2a uses the design of the excellent Pixel Buds Pro 2 with a few high-end features at a more palatable £109 (€129/$129/A$239) price, undercutting rivals in the process.
3 Strictly speaking, the slope is continuous everywhere except for the data points themselves. ↑