这两位选手的水平不相上下。
zhè liǎng wèi xuǎnshǒu de shuǐpíng bùxiāngshàngxià 。
The skill levels of these two competitors are equally matched.
他们的成绩不相上下，都是班里的前几名。
tāmen de chéngjì bùxiāngshàngxià ， dūshì bān lǐ de qián jī míng 。
Their scores are about the same, both are among the top in the class.
这两种方法的效果不相上下，可以根据具体情况选择。
zhè liǎng zhǒng fāngfǎ de xiàoguǒ bùxiāngshàngxià ， kěyǐ gēnjù jùtǐ qíngkuàng xuǎnzé 。
The effects of these two methods are equally matched, you can choose based on the specific situation.