2. Concrete is composed of cement, sand and gravel mixed with water. 混凝土是由水泥、沙子和碎石并和水混合而成的。
3. I walked back along the border of the lawn, traversed the gravel softly, and tiptoed up the veranda steps. 我沿着草坪的边缘走了回去,轻轻跨过石子车道,然后踮起脚尖走上游廊的台阶。
英英解释
n.
1. rock fragments and pebbles
2. cause annoyance in; disturb, especially by minor irritations
3. cover with gravel
4. be a mystery or bewildering to adj.
1. unpleasantly harsh or grating in sound