to be longstanding and well-established
... a well-established friendship: 稳固的友谊 to be longstanding and well-established 源远流长 long-standing and well-established 源远流长 ...
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to be longstanding and well-established
是长期和完善的
以上为机器翻译结果，长、整句建议使用 人工翻译 。