However, to the beginner of lacking knowledge of relevant circuit and signal system, it becomes unexpectedly difficult to work out its oscillation frequency and oscillation condition.
但是对缺乏相关电路及信号系统知识的初学者而言，求其振荡频率及振荡条件竟成为一道难题。
While implementing the parent-child reading activity, some parents'knowledge structures are not complete, lacking knowledge in linguistics, cognitive psychology, reading psychology and pedagogics.
部分家长实施亲子阅读教育活动的知识结构不够完整，缺乏语言学科、认知心理学、阅读心理学、教育学方面的知识。
Lacking knowledge regarding the significance of ecological balance, businessmen sent out ships that insatiably chased fishes and thus posed a severe threat to all life in the sea.
由于商人们缺少对于生态平衡的认识，他们的渔船无休止地捕鱼，给海洋生物的生存造成了巨大的威胁。
Lacking knowledge regarding the significance of ecological balance, businessmen sent out ships that insatiably chased fishes and thus posed a severe threat to all life in the sea.
由于商人们缺少对于生态平衡的认识，他们的渔船无休止地捕鱼，给海洋生物的生存造成了巨大的威胁。
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