These examples were tested on real Bluetooth hardware, so you should see that as I iterated through the Vector, I "backed off" for two seconds before I continued through the loop.

这些示例在真正的蓝牙硬件上测试过，所以您应当看到，当我在Vector中迭代时，我在继续循环之前，“后退”了两秒。

youdao

It involved a series of black letters presented in the centre of a white screen. Each letter was shown for half a second and followed by a blank screen for two seconds before the next letter appeared.

一系列的黑色字母会出现在屏幕中央，每个字母呈现半秒，下个字母出现前持续两秒的空屏，要求参与者尽可能快速而准确地指出每个字母是否与前两个字母出现的字母相匹配。

youdao

When the researchers stretched the material, it turned bright red for a few seconds before it broke into two pieces.

当研究人员拉伸料子时，它会在被抻成两半之前几秒钟就变得鲜红。

youdao

Each letter was shown for half a second and followed by a blank screen for two seconds before the next letter appeared.

ECONOMIST: Cognitive disenhancement

Brooklyn stayed ahead from there, though Chicago got within two with 15 seconds left before Watson closed it out with two free throws.

WSJ: Bench carries Nets past Bulls, 93-89

'' Two seconds later, just before we would have stalled and started a death spiral to earth, the jet's control stick moved forward, and the airplane began to pick up speed, averting the stall.

FORBES: Flying The World's Smallest Business Jet