1. For a few years its luminosity flared up to about 10,000 times the present-day luminosity of the Sun. 有几年它的亮度一度达到了现在的太阳亮度的一万倍左右。
2. What does Marion Nestle say about present-day nutrition studies? 马里昂·奈斯特对当今的营养研究有什么看法？
3. It was little by little that the watch reached its present-day perfection. 表渐渐地达到了现在这样完美的程度。
4. Research shows that present-day women think differently and behave differently from men. 研究表明，现代女性的思维方式和行为方式都与男性不同。
5. Gas mixtures emitted from present-day volcanoes resemble this early atmosphere, suggesting its origin from volcanic eruptions. 现代火山释放出的气体混合物类似于这种早期的大气，这表明它（地球）起源于火山喷发。
