You'd bring along the invincible spear-head with you to be safe.
那你要记得带着这只铁枪头以防万一。
2
We can trust them to update their knowledge in the exploding world of ideas and to constantly remain at the spear-head of progress.
我们能够信任它们能够在知识爆炸的世界里迅速不断的更新他们的知识，保持处于进步的前沿。
3
In the coffin with the skeleton are flint arrow-heads, a spear-head, also of flint, and perhaps the stone head of a battle-axe, the wooden portions of these weapons having long since mouldered away.