These adjectives mean right or correct in view of existing circumstances. They are often interchangeable.

考虑到存在环境时，这些形容词都意为“恰当的或正确的”且通常可以互换。

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The existing circumstances of international trade and production in almond were investigated in this article.

本文中，研究了扁桃国际贸易和生产的现状。

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A major requirement of any longwall mine layout is that it provides the best possible financial performance, given the existing circumstances and limitations.

所有长壁矿井布置的主要要求是在现有环境和限制下提供最佳的可能财务业绩。

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As we watch the events unfolding in Japan and hope for the best possible outcome given the existing circumstances, realize that the economic impact of the tragedy remains unknown.

FORBES: When All Else Fails, Go Long

But we have to adapt to existing circumstances.

WHITEHOUSE: Presidential Press Conference

Accordingly, clients and their advisors, increasingly, are looking for ways to modify existing estate plans, particularly focusing on irrevocable trusts, when circumstances change.

FORBES: "Fixing" the Broken Estate Plan