essential formalities
必要的手续
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Customs declaration is to carry out the customs formalities of inbound and outbound essential.
煟报关是履行海关进出境手续的必要环节之一。
youdao
报关是履行海关进出境手续的必要环节之一。
It stipulates, among other things, standardised forms that all patent offices must accept, basic standards for electronic submission of patents, and mechanisms to avoid loss of rights due to non-essential formalities or unintentional delays.
ECONOMIST: Patent law: Going global | The
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