“受契约约束的”可以翻译为 “bound by a contract” 或者 “contractually bound” 。
“bound by a contract” 强调被契约所限制、约束的状态 。例如：Both parties are bound by a contract to complete the project within the specified time.（双方都受契约约束，需在规定时间内完成项目。）
“contractually bound” 更侧重于从契约角度表明有约束关系。例如：The supplier is contractually bound to deliver the goods by the end of the month.（供应商受契约约束，需在月底前交付货物 。）