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The two-letter system isn't the exclusive way to pick an operation and exercise names.
双字母命名系统并不是命代号名的唯一途径。
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A four way two position valve is required for operation.
阿二位四通阀是所必需的操作。
youdao
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A four way two position valve is required for operation.
阿二位四通阀是所必需的操作。
youdao