《其四》是宋代柳永创作的诗。
一个世纪后，情况完全不同了：这时，世界上已经有了电力工业，其四分之一的发电量是水力驱动的。
A century later the picture was completely different: by then, the world had an electric industry, and a quarter of its generating capacity was water powered.
合成了非天然氨基酸3（4噻唑基）D，L丙氨酸盐酸盐及其四个中间体。
Nonnatural amino acid 3 (4 thiazolyl) D, L alanine hydrochloride and its four intermediates were synthesized.
其四，电褥子使用完后要拔掉电源插头。
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