In protected areas, nonconsumptive uses of the resources present are increasingly being emphasized. Fish watching is one of the prime attractions in the Florida Keys, now rivaling fish catching in terms of economic importance. Whale watching is the basis of a booming business worldwide. Within the recently designated Stellwagen Bank Sanctuary off the coast of Massachusetts, revenues exceeding $100 million a year are attributed to whale watching enterprises; and even greater income is generated in the Hawaiian Islands Humpback Whale Sanctuary. Whale-watching is an economically attractive “sustained use” alternative to the one-time sale of these large mammals as bacon, steak, or sushi----even in Japan, Norway, and Iceland, countries that are actively engaged in killing and selling dolphins and whales for meat.
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On the basis of sustained use.
持续率的基础上使用。
Stylistically, her fly-on-the-wall approach is achieved through the sustained use of the historic present tense, of which she is a master.
曼特尔习惯于运用现在时来描述历史故事，在这一点上她做得十分出色。
The use and application of portfolio management as a solid, useful, and effective organizational process is, thus, "sustained."
将项目组合管理作为可靠的、有用的和有效的组织过程使用及应用，也就是“持续的”。
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