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1·Every GVS application must have at least one scene.

每一个GVS程序都必须有至少一个场景。

2·The Great Vowel Shift(GVS), starting from the 14th century, impacted the English vowels significantly.

其中起始于十四世纪的元音大推移现象对于英语元音的演变起到了深远的影响。