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只要函数f(x,y)适当光滑连续,则常微分方程的初值问题必有唯一解。
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在中国,中秋节是一个全家团圆的节日。按照中国的农历每年的8月15月圆的那天就是中秋节。The Mid-Autumn Festival,Zhongqijie is a festival for families to ____ in China. It falls on the 15th day of the 8th lunar month,when the full moon returns to the sky.
这一天，人们喜欢吃一种圆形的点心，像月亮一样叫做月饼。再配上新鲜的水果，一家人围坐一起欣赏天上又亮又圆的满月。On this day, people eat a moon-shaped ____ called a ____. All the family members sit together, eat Moon Cakes and fresh fruits, and enjoy the sight of the round and bright moon.
就算是那些无法回家的人，也会在中秋节那天抬头望向那一轮圆圆的明月，寄托了对故乡的思念。就是海内外所有中国人的共同情感。就像中国一首著名的诗里所说的海上生明月，天涯共此时。Those who cannot return home look at the round moon and think of their family. Chinese people all around the world share the same tradition. Just like an ancient Chinese ____ says, the moon was rising from the sea and all the people were ____.
每年的农历7月7日是中国的情人节七夕。The Qi Xi Festival, also known as the Chinese Valentine’s Day, falls on the seventh day of the seventh lunar month on the ____.
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