Learning to keep forging ahead and work hard is like sailing against the current. If you don't work hard, you can only go backwards.
Analysis: Learning is like sailing against the current. You must always keep a nervous mind and determination to go forward, otherwise a little slack will be swallowed up by the flood. The so-called learning while doing. For example, you should always remind yourself whether you have made progress or not, and retreat as soon as you slack off. Learning is like sailing against the current. You must always keep a nervous mind and determination to go forward, otherwise a little slack will be swallowed up by the flood. The so-called learning from time to time is a metaphor to remind yourself whether you are making progress at all times, and you will retreat if you slack off.