They rate librarianship skills higher than subject knowledge in on-line searching.
他们认为图书馆技术要比联机检索主题知识更难于掌握.
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Rarely can permanent control be achieved by a single application of spray.
使用一次药剂防治难于持久地控制害虫.
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They are sometimes difficult to differentiate from aromatic or olefinic absorptions.
有时它们就难于和芳香族或烯烃的吸收峰相互区别.
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Conversely, test made in full-scale boilers are usually difficult to reconcile.
与此相反, 在工业规模的锅炉内所做的试验,也难于互相一致.
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His mature compositions are generally considered the more cerebral and crabbed.
他成熟的作品一般被认为是触动理智的和难于理解的.
《现代英汉综合大词典》
开关器件的导通和关断都需要一定的时间,这使理想输出电压波形中的窄脉冲难于硬件实现。
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The chapter was very long, and consisted entirely of names, uncouth and difficult to pronounce.
这一章很长, 包括许许多多人的姓名, 这些姓名陌生而又难于发音.
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