The vowel in words like "my" and "thigh" is not very difficult.单词my和thigh中的元音并不难发。Each language has a different vowel system.每种语言都有不同的元音系统。A long vowel is a long sound as in the word'shoe ".长元音即如“shoe ” 一词中的长音....
The British are not famed for their philosophy and tend to be more practically minded.英国人不是以其哲学思想闻名，而是往往更注重实际。It is proved practically that chemical grouting can do with it.由于翻浆冒泥造成基床的软化和道碴板结引起道床整体弹性的降低,直接影响列车安全运营.Practi...
More ammonium sulphate solution is being recovered in the process of distilling oil shale.在提炼油页岩的过程中回收的硫酸铵液比过去多了.Ammonium chloride under thermal dissociation forms ammonia and hydrogen chloride gases.氯化铵在热力分解作用下形成氨和氯化氢气体...