a halfhearted attempt的用法和样例：
- A halfhearted attempt at writing a novel.
- Eric: He has made a few halfhearted attempts but has never actually stopped for a long period of time.
- It is a systematic attempt to strengthen our competitive ability.
- They took us to a dive with a mariachi band, a halfhearted stripper, and a menu that featured cabrito, barbequed goat head.