Motivated by the filter reconstruction and vanish-moment conditions, a general construction approach based on the state equation was proposed for linear time-invariant systems.

阐述了一种利用消失矩条件和线性时不变系统的状态方程来构造小波的方法。

youdao

The best source of information for the moment is a theoretical model of where the cloud might be, taking into account the prevailing wind and other weather conditions.

考虑到盛行风与天气条件，目前最好的信息来源是尘用埃云的理论模型测定云层位置。

youdao

The timing of Visa's impending IPO is perhaps a sign that the firm believes that market conditions will not improve, but for now the IPO itself is a rare moment of light amid the gloom.

Visa对于此次ipo时机的把握也许显示了这样一个信号，即尽管现在市场情况可能不会转好，但对于首次公开募股，也许是黑暗中难得露出的一点微光。

youdao

"It is not just a case of understanding the activity at the volcano itself, what we are also seeing the effect of at the moment are the prevailing weather conditions because we are in a northerly air stream at the moment and that is bringing the volcanic dust from Iceland down over the U.K.

VOA: standard.2010.04.15

That's a sentiment millions of Americans might share at the moment, even if conditions aren't quite so extreme elsewhere.

CNN: Weather worries prompt school closings in South

"Even though conditions at the moment have calmed down a little bit, that doesn't mean that people can become complacent, " said Tasmania Fire Service's Paul Symington.

BBC: Australia battles scores of bushfires

Accordingly, prices of stocks (and bonds, and commodities, and currencies) fully discount whatever is the aggregate sentiment of the consensus about how attractive (or unattractive) investing conditions are at that moment.

FORBES: Nuclear Meltdown Threat, The Snake You Didn't See