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...
This substance has now been cloned by molecular biologists.该物质现在已被分子生物学家克隆。The two biologists found, to their surprise, that both groups of birds survived equally well.这两位生物学家惊奇地发现，两组鸟都很好地存活了下来。Biologists need to compare...