Touch ground tread on delicate ground

• 触及微妙的问题；碰到棘手问题;小心翼翼；如履薄冰

Touch ground tread on delicate ground的用法和样例：

例句

1. Social workers operate on the razor's edge.
   社会工作者工作时如履薄冰。
2. OPEC is still skating on thin ice.
   要达到这样一些目标，欧佩克依然如履薄冰。