and certainly not practical
Targetting the entrance of the wormhole when you're going near light speed is next to impossible, and certainly not practical, hence why the acceleration structure is necessary.
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and certainly not practical
当然也不实际
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Not too striking, but certainly titillating: warm and friendly with a floor plan that is both spacious and practical.
它不太引人注目，但是确实令人振奋：房屋温暖而友好，楼面规划宽敞又实用。
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