Even the test ban and a new treaty to cut off production of fissile material—both obvious first steps to a nuclear-free future—will be dogged with difficulty.

即使是禁止核试验和起草一份降低核裂变材料生产的新条约-----很显然，二者都是迈向无核未来的第一步----困难也将会如影随形。

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The characteristics of the test signals were analyzed and weak defect echo signals were successfully extracted by cut-off frequency technique.

分析了检测信号的特征，并采用截止频率法成功地提取了微弱的缺陷回波信号。

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The model test for simulating effect of suspended cut-off wall on preventing seepage failure in two-layer foundation of levee has been carried out in a sandbox.

在实验室渗流槽中进行有悬挂式防渗墙的二元结构堤基的渗流模拟试验，取得不同贯入度悬挂式防渗墙防渗效果的系列试验成果。

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First, ending the stalemates on the Fissile Material Cut-off Treaty and the Comprehensive Nuclear Test Ban Treaty.

BBC: In full: Brown security statement

Johnson says he tries to act as a mentor, or life coach, for his students, helping them handle the off-court stress of trying to cut high enough grades and test scores for an Ivy League college.

WSJ: How Squash Got Serious