fulcrum

1. N-SING If you say that someone or something is the fulcrum of an activity or situation, you mean that they have a very important effect on what happens. 支柱[正式] [oft N 'of' n]

The decision is the strategic fulcrum of the Budget. 該決定是預(yù)算中的戰(zhàn)略支點(diǎn)。