They need to be sure the gas will not bubble back to the surface.
他们需要确定气体将不会变成气泡回到地标。
Back then, the article reflected the general optimism that led up to the Internet bubble.
那时候，这篇文章反映了当时普遍的乐观情绪，后来导致了互联网泡沫。
Unemployment, now 3.9%, may head back towards the post-bubble high of 5.5%.
现为3.9%失业率可能会折回到后泡沫时期的5.5%的高水平。
Erika bursts back onto the scene as a cute water bubble!
埃里卡到现场爆发早在一个可爱的水泡泡！
Erika bursts back onto the scene as a cute water bubble!
埃里卡到现场爆发早在一个可爱的水泡泡！
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