If you don't learn to laugh at troubles,you won't接上：have anything to laugh at when you grow old

If you don't learn to laugh at troubles,you won't接上：have anything to laugh at when you grow old
If you don't learn to laugh at troubles,you won't
接上：have anything to laugh at when you grow old

If you don't learn to laugh at troubles,you won't接上：have anything to laugh at when you grow old
如果你不学着嘲笑困难（或是对着困难笑）,那么等你老了以后你就不会对任何东西笑,这是直译.也可以意译为,如果你不学着不把困难当回事,那么等你老了之后你就没法开怀.