If it's a single value (for example, an upper bound on a shoe size, or the maximum number of monkeys that can fit in a barrel), leave the constant as it is.

如果只有单独一个值(例如，鞋的最大尺寸，或者笼子中能装猴子的最大数目)，则还是把这个任务留给常量吧。

youdao

The top portion of the shoe, or the upper, is usually made of leather, synthetic leather, or a combination of materials.

鞋的顶端部分就是鞋面，通常由皮革、合成革或者是材料的组合。

youdao

Its used to determine the peeling strength between the sole and the upper of a shoe.

本机适用于检验成鞋鞋底和鞋帮之间的剥离强度。

youdao

The stores that have managed to open are an eclectic blend of what makes the Upper West Side my favorite neighborhood: the obvious (liquor stores), the odd (a shoe store on Broadway), and the adorable (a flower store on Amsterdam).

FORBES: After Hurricane Sandy, Manhattan Business Is...Booming?