The obligation is to pay patent application fee every year.
义务就是每年都要缴纳专利申请费。
Paying or not paying patent annual fee is in nature a kind of legal fact, rather than fulfilling or offending demeanours of legal obligation.
缴纳专利年费的行为或者不缴纳专利年费的行为的性质都是法律事实，而不是履行或者违反法定义务的行为。
The client must pay the fee (obligation) and is entitled to get the product (benefit).
客户必须付款（任务），并且有权获得产品（权力）。
As a means of balancing the benefit between the public and the patent holder, patent annual fee is one of the necessary parts to keep patent effective, rather than a legal obligation.
专利年费作为一种以平衡公共利益和专利权人利益的立法技术手段，是维持专利权效力的要件之一，而不是法定义务。
The supplier must provide a certain product (obligation) and is entitled to expect that the client has paid its fee (benefit).
供给商必须供给某种产品(任务)，并且有权期望客户付款(权力)。
All parents shall perform assigned school volunteer work unless a fee is paid to waive this obligation. The parents are responsible to fill out the forms upon completion of school duty.
除缴纳过义务服务赦免费的家庭外，所有家长应主动为学校提供义务服务，并及时填写自己的“家长完成义务服务记录簿”。
Laws for Copyright "states that it is one of the author's basic rights to get payment for their writing, and it is a basic obligation for the newspaper office to pay the composing fee."
《著作权法》规定，获得稿酬是作者的一项基本权利，支付稿酬是报刊社的一项基本义务。
Laws for Copyright "states that it is one of the author's basic rights to get payment for their writing, and it is a basic obligation for the newspaper office to pay the composing fee."
《著作权法》规定，获得稿酬是作者的一项基本权利，支付稿酬是报刊社的一项基本义务。
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