grindstones
n.
磨石( grindstone的名词复数 );
砂轮;
持续辛勤地工作;
努力不懈;
例句:
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Caught in the twin grindstones of those pressures, Canada's publicly funded health - care system might not survive.
在奇迹和困难的双重压力下, 加拿大的免费公共健保系统或许将不复存在.
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If students keep their noses to the grindstones, they won't fail the course.
如果学生一刻不停地拼命干, 他们就不会不及格.