This interface defines a contract with three methods, as shown in Listing 1.
这个接口定义了一个有三个方法的合约，如清单1所示。
2
General Dynamics was awarded the contract for Block 1 upgrades to the SLQ-32.
通用动力公司已经获得了SLQ - 32阶段1的升级合同。
3
Raytheon and Lockheed Martin jointly are seeking a Turkish contract worth ＄1 billion to ＄2 billion for the country's first anti-missile air defense systems.