This is a less common level, although fully usable.

这是不太常见的级别，虽然完全可用。

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It is also important to note that the storage is fully usable.

还需要重点注意的是，存储器是完全可用的。

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All of these changes will add a new layer of structure and style to your pages, bringing them closer to being fully usable in your application.

所有这些变化，都会给页面添加新的结构层和样式，使它们更加可用于应用程序中。

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stem cell researchers have found a way to get perfectly usable stem cells from fully grown human beings.

干细胞研究者已经找到了一种方法，
可以从成年人身上获取可用的干细胞。

干细胞和伦理 - SpeakingMax英语口语达人

Pine, the most commonly farmed tree in the U.S., reaches pulp stage in 10 to 14 years, is ready for saw mills near age 20, and by age 25 to 27 is fully mature and usable for framing lumber, plywood and telephone poles.

WSJ: Wealthy Investors Discover Timberland