(1)Put some iron nails at the bottom of a test tube.

(1)把几枚铁钉放入试管底部。

So boat builders began to use iron nails for fasteners rather than sewing.

因此造船工人不再使用拼接工艺，开始用铁钉加固船板。

He painted the top with red and yellow colors and drove an iron nail into it.

他用红色和黄色的颜色在陀螺上又涂又画，然后把一根铁钉在了上面。

But it is not so hard as iron, for it is easily scratched by an iron nail.

不过它的硬度又比不上铁，因为我们可以用铁钉轻松地在铜的表面留下刮痕。

The president, who looked like a rusty iron nail, felt that his courtship was progressing.

生锈铁钉般的社长感觉自己的求爱有了进展。

The entrance door was a huge one made of massive, curiously shaped panels of oak studded with big iron nails and bound with great iron bars.

大门是一扇巨大的门，由形状奇特的大橡木板制成，上面镶嵌着大铁钉，并用大铁条捆扎。