单词：arc secants
【数学】反正割(符号 sec⁻1)[亦作 inverse secant]
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英语说遍全球文化
Several years ago, Iris Arc Crystal, a company I co-founded with Francesca Patruno, experienced a 1)lull in business. We had recently hired several new employees and hoped that the 2)slowdown was only temporary. However, in the meantime, we had work
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音乐咖啡厅
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