英语
西班牙语
英语
西班牙语
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单语范例（未经PONS编辑处理）
Several rock-lined parts of the tunnel were found to be unstable.
en.wikipedia.org It is unstable and therefore must be prepared shortly before use, which has possibly led to the lower efficacy shown in some clinical trials.
en.wikipedia.org This may make the mine unstable i.e. can detonate simply by handling it.
en.wikipedia.org It is known that people in vulnerable and unstable states are often chosen to be mediums for deities.
en.wikipedia.org The world has become geographically unstable, with vast natural disasters.
en.wikipedia.org