GRE：核心词组之thus,far thusfar

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thus far 到目前为止
　　释义
　　You use thus far to indicate up to this point.
　　例句
　　A successful and effective mortgage-finance reform bill could fix what"s broken in the current system and build on what has worked thus far.
　　GRE
　　Given the great expense of conducting such experiments with proper controls, and the limited promise of experiments performed thus far, it is questionable whether further experiments in this area should even be conducted.
　　由于控制这类实验需要大量的投入，同时目前看来其结果并不明朗，因此这个领域是否值得在未来继续探索还有待商榷。