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- We have four periods of English a week. 我们每星期上四节英语课。
- Play lasts for four periods of five minutes each. 比赛分4节，每节5分钟。
- I've been teaching four periods this morning. 今天上午我已教了四节课。
- The bitch's cycle is divided into four periods. 母犬的发情周期被分为一下四个阶段。
- We have four periods in the morning. 我们上午上四节课。
- We have four periods of art a week. 我们一周有四节美术课。
- I have been teaching four periods already this morning. 今天上午我已经上了四堂课了。
- Lenin's view on Marxism develops and distills logically in these four periods. 列宁的马克思主义观就是在这四个时期逻辑地发展和升华的。
- The history of the united front in the cultural revolution during the last twenty years can be divided into four periods. 这种文化革命的统一战线，二十年来，分为四个时期。
- In PL,the first effect was Freckles,the second was Ota nevus needing four periods at least. 色素性疾病治疗中疗效最好为雀斑 ,其次为太田痣需四次左右 ;
- It retraces the four periods of our culture industry to make clear its development veining. 通过对我国文化产业发展取得的成效和发展中存在问题及原因的分析,以把握我国文化产业发展现状。
- The SBR goes through four periods，i. e. water inflowing，reacting，settling，draining periods. 该核心工艺是SBR，其运行周期主要分为进水期、反应期、沉淀期、排水期等四个阶段。
- Results:In PL,the first effect was Freckles,the second was Ota nevus needing four periods at least. 结果:色素性疾病治疗中疗效最好为雀斑,其次为太田痣需四次左右;
- The establishment of the ancestral temple system went through the four periods of yuandi,chengdi,aidi and pingdi. 其宗庙制度的确立经过了元、成、哀、平四个时期。
- Make a chart displaying the four periods of prophetic ministry mentioned in this lesson (Early Monarchy, Assyrian Judgment, Babylonian Judgment, Restoration Period). 做一张图来显示（在黑板或投影片上）本课中所提及的先知事工的四个时期(早期王国时期，亚述审判时期，巴比伦审判时期，复兴时期)。
- In those areas that have had three or four periods of experimental burning only half the number of species of tree seedlings originally found are still there. 在经历过三个或四个周期的试验性焚烧后，最初在该地区发现的树苗只有半数的种类能幸存下来。
- The thought of democratic socialism and scientific socialism has been through four periods consist of intergroup, metamorphosis, division and reform due to the historical routine. 从历史沿革看,民主社会主义思潮和科学社会主义经历了共生、蜕变、分化、重建四个发展阶段。
- The propose of "Four Period of Tang Poetry" reflected that the historical stages of Tang poetry were more ahistorically and logically. “四唐说”的拈出,标志着人们对唐诗流程有了更合乎历史与逻辑的分期。
- The distribution of Fe in potato in the first four periods was in the decreasing order of leave>stem>tuber and it changed to be stem>leave> tuber in the mature period. 铁的累积量在整个生育时期呈现先增大后减小的变化规律，均在块茎膨大期达到峰值；
- There are four periods in the development of curriculum, and the venation of curriculum ideas is from pristine heterogeneity to dissimilation and division and to new further heterogeneity. 课程伴随人类社会发展经历了四个重要时期，在理念上表现出从原始和谐，到异化与分裂，再到走向新和谐的发展脉络。
