“受契约约束的”可以翻译为“bound by contract” 或者 “contractually bound” 。
例句：
Both parties are bound by contract to fulfill their respective obligations.（双方都受契约约束，需履行各自的义务 。）
The supplier is contractually bound to deliver the goods by the end of this month.（供应商受契约约束，需在本月底前交付货物。）