1.Ralph had two theories about this intervener.
拉尔夫对这位介入者作了两种推测。
2.How does domestic politics in the intervener's society affect decisions to intervene?
干预者社会中的国内政治是如何影响干预决定的？
3.China is overwhelmingly the dominant intervener, accounting for 40 per cent of the accumulation since February 2009.
中国绝对是最明显的干预者：自2009年2月以来，占到了这些外汇累积的40%。
4.Unfortunately, it is also the world's most effective intervener.
不幸的是，其却是世界上最有效的干预者。