These volcanoes are so explosive that they burst open in a single big crack, leaving behind a vast hole, the caldera.

这些火山具有极强的爆发性，以至于在它们从一条大的裂缝中喷涌而出，留下了一个巨大的洞，也就是火山口。

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It appears that the shell has to crack open or break down somewhat to allow the seed to soak up water.

看来，为了让种子吸收水分，种子的外壳必须裂开或破裂。

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These are volcanoes so explosive that they burst open in a single big crack.

这些火山爆炸性极强，爆发瞬间出现了一道大裂缝。

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When I had waited a long time, without hearing him lie down, I decided to open a little -- a very,very little -- crack in the lantern.

VOA: special.2009.05.16

Also a nearby volcano erupted four years ago,ripping open a crack in the Great Rift Valley.

VOA: standard.2009.12.14

But, noting that former Washington Post Co. board members and longtime Graham family friend Warren Buffett was a supporter of paywalls, he left the door open a crack to the possibility of adding one at the Post.

WSJ: Washington Post Plans a Paywall

When asked directly about this possibility, AMD was a bit coy and continued to insist that x86 is alive, healthy, and slated for a magnificent future, but nonetheless left the door open a crack with respect to the potential that ARM cores could ultimately replace x86 cores in some future products.

FORBES: AMD Woos Developers With Promises Of Efficiency

Once you open the window a crack, you're gonna have to throw open the doors eventually.

CNN: Review: 'The Muppets' still finding its felting