After meeting with China’s top diplomat in Malaysia last summer, Secretary of State Marco Rubio uttered a line that made few waves at the time but would later help pave the way for an abrupt change. 去年夏天在马来西亚会见中国最高外交官后，国务卿鲁比奥说了一句话，当时未引起太大动静，但这句话后来为突如其来的政策转变铺平了道路。…