Many forest tree species have multiple archegonia which, after fertilization produce a number of proembryos.许多林木树种都有颈卵器, 受精以后便产生许多原胚.A similar section through the female plant reveals several bottle - shape archegonia , ...
他在磨石上磨快了他的刀刃.He sharpened the edge of his knife on a grindstone.难道绕来绕去,绕到磨石口来了 吗 ?Could it be that all these detours had brought them to Moshi Pass?它调节的是石磨的输出,而不是磨石的马力.It regulated the output but not the power of a mills...
我们必须像外科医生拿手术刀时一样冷静客观，不受任何感情影响。We must be as impersonal as a surgeon with his knife.这是当年白求恩大夫用的手术刀.This is the scalpel which Norman Bethune used in those days.医生慢慢地把手术刀从病人的胃里拉出来。The doctor drew the lancet out slowly from ...