▲be critical of 表示（对某人/某事）批评、挑剔。

• Many parents are strongly critical of the school. 我的的父母对学校提出了强烈的批评。

• His report is highly critical of the trial judge. 他在报告中对主审法官有颇多批评。

• The report is highly critical of safety standards at the factory. 这篇报道尖锐地批评了那家工厂的安全标准。

▲be critical to 表示（对某人/某事）重要、关键。

• Your decision is critical to our future. 你的决定对我们的将来至关重要。

• The President's support is critical (to this project).  总统的支援（对该计划）至关重要。

• How you finance a business is critical to the success of your venture. 如何融资对企业的成功至关重要。

▲此外还有一个“It is critical to do”的句型是不定式充当主语，表示“做某事很重要”，不要与此结构混淆。