wing without valves 无阀翼板
without valves
没有阀门
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Like early horns, early trumpets were "natural" instruments, without valves.
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Without the safety valves of emigration to Europe, which is getting harder, and families' willingness to support those out of work, Morocco would look far less stable.
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