Perfect number, amicable number and anti-sociable numbers are important topics in number theory.
完全数、相亲数以及孤立数一直是数论研究的一个重要课题。
A lone acacia tree provides solace to sociable weavers, small birds who have built a number of large, interconnecting nests within its branches.
一棵形单影只的金合欢树为喜欢群居的织布鸟和在树枝间筑起许多巨大互连鸟巢的小鸟们带来了慰藉。
A lone acacia tree provides solace to sociable weavers, small birds who have built a number of large, interconnecting nests within its branches.
一棵形单影只的金合欢树为喜欢群居的织布鸟和在树枝间筑起许多巨大互连鸟巢的小鸟们带来了慰藉。
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