He couldn't help thinking his mama had been a little tougher when she found out about the Immortals.
The best poles are obtained in Norway from small, slender, drawn-up trees, growing under the shade of the larger ones in the thick woods, these being freer from knots, and tougher from their slower growth.
Lignite and cannel are usually dull and earthy, and of an irregular fracture, the latter being much tougher than the black coal.
In metal bridges wrought iron has been replaced by mild steel - a stronger, tougher and better material.
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