Attach a sharp stone to the end of astout piece of wood, and with this lever you can hugely increase thespeed, force, effectiveness and safety with which the axe can bewielded.

将一块带有尖刃的石器和一根强壮的树枝接在一起，利用这根长矛人类可以极大地提高速度、力度、效率和安全性。

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Beer and sharp axes don't really go well together, but Hudson says safety is their top priority.

啤酒和锋利的斧头其实并不能友好相处，但是哈德森说安全是第一位的。

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Wear safety shoes to prevent foot injuries that can be caused by falling objects or sharp metals.

防止足部被掉落物件或尖锐金属等所伤，应穿安全鞋。

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Now it seems that there will be "trickle-up" instead: Volvo's sharp design, excellent safety engineering and strong build quality will influence everything Ford does.

FORBES: Overview

My mother instructed me to have a sharp elbow or a safety pin always at the ready, advice that is still handed down to Indian girls today.

WSJ: India Needs a Sexual Revolution

Claims for such injuries have soared in recent years despite improvements in vehicle safety and a sharp reduction in the number of reported accidents involving personal injury.

BBC: Search the