To take a long-term approach, willing to forgo immediate small gains for much greater future benefits; to play the long game.
他知道这个项目短期内不会有显著回报，但他相信这是在放长线钓大鱼，未来收益会很可观。
He knows this project won't have significant returns in the short term, but he believes it's casting a long line to catch a big fish, and future profits will be considerable.
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