num.三十一
Thirty one Practical Key Sentences. 个实战经典句型。
S/N: Shadow of One hundred and thirty one. 南北湖是在杭州附近？一天游可以了。
The government loses twenty seats and gained thirty one, make a net gain of eleven. 政府丢掉20个席位，又赢得了31个席位，净得席位为11个。
Methods Thirty one cases difinite diagnosed as thyroid microcarcinoma were analysed retrospectively. 方法对诊断明确的31例甲状腺微小癌进行回顾性分析。
When I talk to others they feel surprised to know that thirty one thousand youths are inhumanly living in the physically difficult situations. 当我告诉别人情况的时候，他们为三万一千青年在物质条件极其困难的情况下所过的非人生活感到惊讶。
Methods: Apply fiberoptic ducoscopy to examine the thirty one cyclomastopathy patients, who were certained by previous clinical diagnosis. 方法：对既往临床诊断为乳腺增生病的31例患者行乳管镜检查，根据镜下所见来加以分析。
