Hi, I am Helen Zhang, a professional Chinese language teacher from eChineseonline.
Please see the translation and explanation below:
sān tiān dǎ yú, liǎng tiān shài wǎng
三天打渔，两天晒网

This idiom  literally translates to “go fishing for three days and dry the nets for two.” It is usually used to indicate when someone starts something, but doesn’t persevere or stops during the proc-ess. .