A regular expression followed by? Matches zero or one occurrence of the regular expression.
号后面的正则表达式可以匹配这个正则表达式的零次或一次出现。
Finally, central Banks can try to circumvent the zero lower bound by buying long-term debt.
最后，央行可以试着通过购买长期债来绕过不能低于零利率的约束。
Turks are being driven by business interests and the "zero problems" policy.
而土耳其人的动力在于商业利益，以及“零争端”的边界政策。
But, he pointed out, interest rates are constrained by the zero lower bound.
但是，他指出利率被零下线制约。
Simply fix the value for the port by specifying a number in place of zero.
在“0”的位置指定一个数字就可以简单地固定端口的值。
Start it by going into the MyNewApp directory and type zero start.
首先转到MyNewApp目录然后输入zerostart。
The integral of y will be zero also by symmetry.
由于对称性，y的积分值为。
Zero stability and good and is not affected by the fluid noise interference.
并有极好的零点稳定性和不受流体噪声干扰影响。
Zero is the only number that cannot be represented by Roman numerals.
零是唯一的数字，不能由罗马字目代表。
Zero Inventory is guaranteed by the full market supply and Just-In-Time (JIT).
零库存要由充足的市场供应和准时制配送来保证。
The characteristic equation is formed by setting D(s) equal zero.
将D（s）等于零可以得到特征方程。
And the hope is to reach a zero population growth rate by 2010.
到2010年的时候，有希望达到人口增长率为零。
The flux through the wall of the vortex tube is zero by its definition.
根据涡管定义，穿过涡管管壁的涡量为零。
The flux through the wall of the vortex tube is zero by its definition.
根据涡管定义，穿过涡管管壁的涡量为零。
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