touch wood 老天保佑；好运常在；但愿走好运

【例句】
The deal will be agreed on Wednesday, knock on wood.
这笔交易将在星期三达成，老天保佑。

I've been driving for over 20 years and never had an accident ─ touch wood!
我开车20多年从来没出过车祸，但愿老走好运！