从撒克逊时代起就开始采伐塞文山谷的这些树林获取木料。These Severn Valley woods have been exploited for timber since Saxon times.他们清除了大片的森林以经营农耕、采伐与畜牧。They cleared large tracts of forest for farming, logging and ranching.在过去十年里,这个山谷的林木被大肆采伐.This va...
Have you done your home-work, Gemma?杰玛，你做完家庭作业了吗？Good - bye , and thanks for bringing Gemma in.再见, 谢谢你们把Gemma送来.Let's take Gemma by there now.我们赶紧把Gemma送去....
海洋微生物腐烂后沉积形成磷酸盐。The phosphate was deposited by the decay of marine microorganisms.每年河水泛滥时都会在田野上沉积一层淤泥.During the annual floods the river deposits its silt on the fields.河口沉积了淤泥.The river deposited silt at its mouth....