impetus

这项新发明为科技发展提供了强大的推动力。

The new invention gave a strong ___impetus to technological development.

那次濒死经历给了他修复生命中每一段破裂关系的推动力。

The near-death experience gave him the ___impetus to repair every broken relationship in his life.

公众对污染报告的愤怒成为新环保法规出台的推动力。

Public outrage over the pollution report served as the ___impetus for new environmental regulations.