Elderly residents were vaccinated in Rio de Janeiro on Tuesday, the last day before the city's vaccination program halts until new doses arrive.

周二，里约热内卢的老年居民接种了疫苗，这天之后该市将暂停疫苗接种计划，以等待新疫苗的到来。

In essence, We're building a machine that does the opposite of what H says: halt if the program doesn't halt and run forever if the program halts.

从本质上讲，我们正在构建一台机器，其功能与 H 所说的相反：如果程序不停止则停止，如果程序停止则永远运行。