plan fail的用法和樣例：
例句
- The plan failed by reason of bad organization.
由于組織不健全，這計劃失敗了。 - Jack always has a card up his sleeve, so when his first plan failed he tried another.
杰克袖中總有妙策，因此，當他第一個(gè)計劃失敗后，他又試行第二個(gè)計劃。 - If the first plan fails, we can fall back on the second.
如果第一計劃失敗了，我們還可以依靠第二個(gè)計劃。
