3句英文任你选

I'm afraid you'll have to wear an overall. It's a hygiene requirement.
请穿上工作服，这是卫生上的要求。

That's dangerous. Please keep off.
那里很危险，请勿靠近。

It's very important not to touch the machinery.
不要乱摸机器很重要。

半个句型要记牢

keep off (远离，避开)

Tip:

keep off和keep out都有"避免，逃离"的意思，但用法有别: keep off 意思是"(使)不接近;挡开，避开，远离如 He drew the curtain to keep the sun off. (他拉上窗帘以遮住阳光。) ;keep out则表示"(使)不进入，使其等在外面如 Warm clothing helps to keep out the cold. (保暖的衣服可以御寒。)