It's an even chance that he comes.

他来的可能性为百分之五十.

《简明英汉词典》

He stands an even chance of winning.

他胜负的可能性各占一半.

《现代汉英综合大词典》

It was an even chance who went in either plane.

谁乘哪一架飞机,两人有同等的机会.

辞典例句

He has an even chance of being accepted by the program.

他有百分之五十的机会被吸纳进这个项目.

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Doctors had given him an even chance of survival.

医生给了他同等的生存的机会.

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He has an even chance of success.

他成败的机会参半.

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