The alternative, that the carbon came from the volcanoes, is unlikely because the spike is much shorter than the period of volcanic activity.

另一种说法是这种碳元素来自于火山，但这不可能，因为碳数量激增期比火山活动期要短得多。

youdao

But there were a record 26 Predator drone attacks last month, a spike in activity that suggests something is going on.

但是有一份记录表明26名袭击者在上个月发动了袭击，这次袭击如一根利刺，好像暗示着有什么事情将要发生。

youdao

Difference of them prove flow intensity of spike neck not only relate to roots vigor, may have close ties with the leaf, stem sheath and activity of capacity of reservoir.

它们之间的差异说明穗颈节间的伤流强度不但与根系活力有关，可能与叶片、茎鞘及库容活性也有密切联系。

youdao

In the seconds before the insight appears, a brain area called the superior anterior temporal gyrus (aSTG) exhibits a sharp spike in activity.

WSJ: Jonah Lehrer on How to Be Creative

We may see a spike in activity such as increases in ticket sales, but I am not entirely convinced that there'll be a significant sustainable stream of revenues.

CNN: David Beckham to donate PSG wages to children's charity

Both Hewlett-Packard 's (nyse: HPQ - news - people ) Utility Data Center model and Sun Microsystems ' (nasdaq: SUNW - news - people ) N1 approach stress filling computers with the heaviest possible workloads--a change from the standard model of buying new servers when they run at 30% of capacity, for fear of hitting the occasional spike in activity.

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