Foreigners’ struggle with tones is well documented, and has been explored in the past through several types of experiments, which include oral reading experiments, tone differentiation experiments, and production experiments.
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But experimentation stopped in the summer, and it turns out from the records of production after the experiments that output tended to fall in the summer anyway.
但是实验是在夏天停止的，而实验结束后的关于生产的记录说明产出在夏天都会下降。
Production principle, character and primary influence factors of Descartes ray are studied by experiments on the basis of theoretical analysis.
在理论分析的基础上，通过试验着重研究了纤维笛卡尔线的产生机理、特征和主要影响因素。
These plants are equally suited for laboratory experiments and for small scale or large scale pharmaceutical and biological production.
这些装置能够满足药品和生物制品的实验研究、小规模和中大规模生产的不同层次需求。
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