不过，四川地下发生的事情的确切机制仍不明确。
Still, the exact mechanics of what happened underground in Sichuan aren't clear.
进行激发试验时，明确激发药物或物质的确切剂量很重要，并需以最小的速度增加剂量。
When conducting provocation tests it is essential to know the exact quantity of the drug or agent and to give very small incremental doses.
我们很难确定巧克力诞生的确切年代，但有一点是很明确的，那就是自诞生之初，巧克力就一直备受珍爱。
It's hard to pin down exactly when chocolate was born, but it's clear that it was cherished from the start.
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