除去航天航空工业，加州占高科技工作的份额一直稳定的保持在全国20%以上，李维先生估计说。
Excluding aerospace, California's share of the country's high-tech jobs has remained steady at just over 20%, estimates Mr Levy.
由于这种鱼很难监测到，所以对它们数量的估计也不稳定。
They are also very tough to monitor, so population estimates are wobbly.
XNI公布差不多有两年了，一直很稳定，估计将来也不会有大的变化。
XNI was declared stable almost two years ago and it is not expected to undergo major changes in the future.
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