a kilometre and a half of bitumen一公里半的柏油路面contain bitumen含沥青The irradiation stability of bitumen and bituminized producthas been investigated.本文研究了沥青及沥青固化产品的辐照稳定性.The article introduced the category of natural bitumen an...
She addressed them by hand in her beautiful italic script.她用漂亮的斜体字写明了收信人姓名和地址。It is worth taking the trouble to sieve the fruit by hand.值得费点劲用手挑挑果子。Rice farmers here still plant and harvest their crops by hand.这里种植水稻的农场主...