虎头蛇尾

xǔ duō rén xué yīng yǔ dōu shì hǔ tóu shé wěi kāi shǐ sì hū hěn rèn zhēn kě jiān chí bù liǎo jǐ tiān

许多人学英语都是虎头蛇尾，开始似乎很认真，可坚持不了几天。

When they started learning English, it looked as if they really meant business, but their efforts soon petered out.

bǎ nǐ de xiàng mù jì xù xià qu bù yào hǔ tóu shé wěi

把你的项目继续下去，不要虎头蛇尾。

Carry on your project. Don't let it be a flash in the pan.