We shall study a very particular kind of sequences, called convergent sequences.我们将研究称为收敛数列的很特别的一类数列.Generating functions are an ideal tool for studying sequences defined by recurrence.母函数是研究用递推关系来确定的函数的最理想工具.Heterochrom...
我快活自由，身体健康，积极乐观。I am happy and free, in good health, gay and cheerful.女孩子们拿着桶和铲子在沙滩上快活地玩耍。The girls happily played in the sand with buckets and spades.我正过得开心快活着呢.I'm having a rollicking good time....
So trade between the two nations has been something of a one-way street, with Cuba deriving the benefit.所以在两国的双边贸易中可以说只有古巴从中受惠。Rather than deriving expressions for these surfaces let's justify the above remarks.我们不去...
The Negro minstrel is touring the country.那个黑人歌舞团正在全国各地巡回演出.A strong love has sprung up between the minstrel and the king.于是吟游诗人与国王之间就产生了深厚的感情.The young minstrel had a rare, rich voice.这个青年歌手有一幅稀有的嘹亮嗓音....