半途而废

面对复杂多变的外部环境，我们做事必须做到半途而废。

miàn duì fù zá duō biàn de wài bù huán jìng, wǒ men zuò shì bì xū zuò dào bàn tú ér fèi.

Faced with a complex and ever-changing external environment, we have to give up halfway.

学习任何一门技能都要持之以恒，绝不能半途而废。

xué xí rèn hé yī mén jì néng dōu yào chí zhī yǐ héng, jué bù néng bàn tú ér fèi.

You must persevere in learning any skill and never give up halfway.