Which means
American officials could decide—say, in a conflict with China—to switch
off or degrade the signals coming from GPS satellites.两个破折号内的内容是插入语吗?为啥,say用原型啊,翻译成“如果说”?
Government cannot inject a single dollar into the economy if it has first taken that same dollar out of economy.改错。请问老师,下面这个解析是不是有错误,1.inject...应该发生在take...之后?2.是否可以把if改成unless?