Fortunately, an Ant task has been written to do this very thing for JMeter: it executes load tests while providing a way to pass in optional parameters and properties.

幸运的是，已经有人编写了一个Ant任务来为JMeter做这件事：它执行负载测试，同时提供了一种传入可选参数和属性的方式。

youdao

Metal test frame, equipped with adjustable supporting feet, fabric installation clip and aluminum ashes plate. But will set a placed in optional on the balance of and digital readouts.

金属测试架，配有可调支脚，织物安装夹及铝制灰烬盘。可将套具放置在可选配的天平上并数字读数。

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It is said that in England death is pressing, in Canada inevitable and in California optional.

据说，在英国死亡是迫在眉睫的，在加拿大死亡是不可避免的，在加州是可以选择的。

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Things that might have been optional in the past for job seekers are now mandatory.

VOA: standard.2010.07.28

There is room to comfortably seat as many as five adults, plus two small children in optional rear-facing jump seats.

WSJ: Tesla Takes Luxurious Route to the Electric Car

The machine has a space built into the side of its display that allows you to add in optional 802.11b or Bluetooth wireless modules that slide into that space in the back of the notebook display.

FORBES: Magazine Article

These models come with Ultrabook innards starting with low-voltage versions of the Core i5 and the NVIDIA 630M, and they also come with HDMI-in and optional TV tuners so they can be used in a living room or kitchen situation.

ENGADGET: Acer's Windows 8 all-in-ones cause big fuss in Taiwan, we go hands-on to find out why (video)