例句與造句

1. Spain bought that gold from the Swiss National Bank with Swiss francs received as payment for the transport of Portuguese products through Spain to Germany, including tungsten for hardening tank armor.
2. Spain bought that gold from the Swiss National Bank with Swiss francs it had received in payment for the transport of Portuguese products through Spain to Germany, including tungsten for hardening tank armor.
3. It's difficult to find hardening tank in a sentence. 用hardening tank造句挺難的