英国煤层的平均厚度为1米。The average UK coal seam is one metre thick.他正忙于勘探煤层.He is busy with proving up a coal deposit.煤层的炭化程度取决于温度.The degree of carbonization of coal depends on the temperature....
现在天气冷极了，地面都冻硬了。It was bitterly cold now and the ground was frozen hard.把它冻硬，但是不要硬得像石头一样。Freeze it only until firm but not rock solid.雪橇在冻硬了的雪上顺利滑行.Sledges run well over frozen snow....
It was just gone 7 o'clock this evening when I finished.今晚我做完的时候刚过7点。He sat listening to the tick of the grandfather clock.他坐在那儿，听着落地式大摆钟嘀嗒作响。Outside, Bruce glanced at his watch: "Dear me, nearly oneo'clock."出了...