In writing an essay one must do a lot of pruning.写文章要下一番剪裁的工夫.A sapling needs pruning, a child discipline.小树要砍, 小孩要管.Firms are cutting investment and pruning their product ranges.公司正在减少投资，缩减产品系列。...
Chitin synthase is the important enzyme that converts UDP - GlcNAc to chitin.摘要几丁质合成酶是生物合成几丁质的关键物质....recent converts to vegetarianism.最近开始热衷于素食主义的人Converts to beta - carotene, which is needed to maintain eye health.能转化成...