SHIPMENT BY ANY ISRAELI/UNSANCTIONED COUNTRY'S FLAG CARRIER/PORT IS STRICTLY PROHIBITED AND THE CARRYING CARRIER SHOULD BE FREE FROM ALL ENCUMBRANCES.A CERTIFICATE TO THIS EFFECT FROM CHARTER/MASTER/CARRIER OWNER/AGENT SHALL ACCOMPANY THE ORIGINAL SHIPPING DOCUMENTS.这个条款要求船公司出证明所用的货运船不挂靠以色列及未经允许的国家的旗或者港口,可是后面还有一句THE CARRYING CARRIER SHOULD BE FREE FROM ALL ENCUMBRANCES,这句话是什么意思。在船公司证明当中也要放入这句话吗?