溜掉

zhè yī cì bié zài ràng tā cóng nǐ shǒu zhǐ fèng zhōng liū diào le

这一次别再让它从你手指缝中溜掉了。

This time, do not let it slip through your fingers.

jué bù yào ràng tí gāo yīng yǔ shuǐ píng de jī huì liū diào le

决不要让提高英语水平的机会溜掉了。

Never let a chance to improve your English slip by.