该等留置权可以通过法律的明文规定以及合同当事人间的明示约定而获得。

Such lien can be obtained by express regulations or rules of law and express agreement between contractual parties.

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一个合同可能包含有明示或默示条款。

A contract may contain both express and implied terms.

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口头证据规则仅阻止当事人以外在证据对抗书面合同的明示条款。

The parol evidence rule only prevents a party from relying on extrinsic evidence as to the express terms of a written contract.

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