染色体数〔的〕变异 chromosome variations in number
染色体数的变异
Variation in chromosome number
以上为机器翻译结果，长、整句建议使用 人工翻译 。
他们研究被称为拷贝数变异（CNV）的染色体的删减和复制，发现在患有多动症的儿童中有 16% 都存在。
Their study looked for chromosomal deletions and duplications known as copy number variants (CNV) and found that these were present in 16% of the children with ADHD.
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