optional variants

例句：

1. 1. The new software has several optional variants for different user preferences.
   这款新软件有几种不同的可选变体，以满足不同用户的偏好。
2. 2. In the field of genetics, there are many variants of the same gene that can be used as alternatives to standard genes.
   在遗传学领域，同一基因的许多变体可以作为标准基因的替代品。
3. 3. The company is considering several alternative variants for its new product line.
   该公司正在考虑其新产品线的几种替代变体。