toss-up
noun/ˈtɒs ʌp/
/ˈtɔːs ʌp/
[singular] (informal)- a situation in which either of two choices, results, etc. is equally possible
（两种选择、结果等的）同样可能，均等机会 - ‘Have you decided on the colour yet?’ ‘It's a toss-up between the blue and the green.’
“你决定了要什么颜色没有？” “在蓝色和绿色之间实在难以取舍。”
- ‘Have you decided on the colour yet?’ ‘It's a toss-up between the blue and the green.’