虽然开发一次性的转换会更简单，但是就经验来看，相对于开发这种类型的转换所需的工作量来说，它们的用途是非常少的。

While one-time-only transformations may be easier to develop, it has been our experience that these types of transformations see very little usage relative to the effort required to create them.

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由于一次性手套有许多用途，他们在准备出售前必须经过严格的检查。

Given the many USES for disposable gloves, they must undergo rigorous inspection before they are ready for sale.

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苯乙烯是重要的化工原料，可以生产多种产品，其中一次性泡沫包装和饭盒用途较大并存在着较大的争议。

Styrene is an important material for many chemical productions in industry. Foamed polystyrene has been used to produce disposable table ware, and there are also some arguments about its USES.

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