Welded tuff is commonly rhyolitic in composition.

焊接凝灰岩在组成上通常为流纹岩。

The Lubaka tuff does not contain minerals that can be dated radiometrically.

路贝卡凝灰岩并不包含能通过放射性来确定年代的矿物质。

The sedimentary rocks are graywacke, siltstone, tuff andpellitie, etc.

沉积岩有杂砂岩、粉砂岩、凝灰岩、泥质岩等。

There were basalt almond-shape basalt and tuff there.

有变橄榄玄武岩、变杏仁状玄武岩、变玄武岩和凝灰岩。

And now I wish I could be tuff enough lest catching cold.

现在我只能祈求自己坚强一点，最好不要感冒。