The men in the long-term group took the supplements for an average of 18 years. The men in the short-term group did so for an average of a year, with the longest being three years.
长期组的人服用补充剂平均18年，短期组的人从现在才开始服用，平均才一年，最长是三年。
There are, at present, three difficulties in western countrysides, such as short of funds, great difficulty in construction and long time limit for a project.
阐述了目前西部农村建桥的三大困难：建桥资金缺、施工难度大、建设工期长；
Memory, as a important factor in foreign language learning, can be processed into three stages, that is, with sensory storage as the first stage, short term memory second and long term memory third.
记忆在外语学习过程中十分重要，由三个阶段构成。第一阶段为感觉储存阶段，第二阶段为短时记忆阶段，第三阶段为长时记忆阶段。
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