Brittle break of the hornfels;

角岩脆性断裂；

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I cannot quantify the physics of friendships and do not know exactly how much intense pressure can be applied before these glittery, brittle bonds break.

我没法把我们的友谊量化，也不能确切地知道，在我们闪光而易碎的骨头断裂之前，我们能到底能承受多大的压力。

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When you tried to saw the wood or to break it apart, you discovered the wood is actually pretty brittle which makes it virtually impossible to build with.

当你试图把它们锯断或剖开时，你就会发现其木质实际上非常脆弱，根本无法用来做建材。

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Bone mineral density may be compromised by tobacco, making bones more brittle and break-prone.

CNN: Dangers on the Home Front

Wander into any eighth-grade science fair and you're likely to see an example of this destructive process at work - place two dissimilar metals in an electrolyte solution and one of the materials will slowly steal ions from the other, causing it to oxidize, become brittle and eventually break apart.

ENGADGET: Engineering a better bicycle with DBC City Bike Design Alt

But Berdych had other ideas, targeting Federer's unusually brittle second serve to break in games two and six before serving out the 27-minute third set.

BBC: Wimbledon 2010: Roger Federer stunned by Tomas Berdych