black codes

常见例句

When Toyota subsidiary Denso originally developed QR codes in their black and white form, they were meant to serve a functional use as a means to track auto parts.
当初日本丰田汽车公司（Toyota）的子公司日本电装公司（Denso）开发出黑白二维识别码只是为了跟踪汽车部件。
Indeed, America and Britain were so deeply penetrated that the Russians soon found out about Venona, changing their codes and cipher machines on October 29th 1948—“Black Friday” for code-breakers.
毫无疑问的，美国和英国非常清楚苏联很快就发现了Venona的存在，并更改了了他们的密码和密码机在1948年10月29号—译码者的“黑色星期五”。
Bar codes, familiar to us all as the black and white rectangular mark that enables products in a supermarket to be tracked, represent data using the spacing of parallel lines.
条形码就是我们大家都熟悉的超市中用来跟踪商品的那些黑白色相间的长条标记，它利用这些黑白色平行线的间距来表示数据。

Black Codes and Jim Crow laws once disarmed and disenfranchised people on the basis of race.
FORBES: Move up http://i.forbesimg.com t Move down
As huge fans of both technology and art, our team decided to play around with some QR art concepts, borrowing some elements from traditional graffiti (drips), technology and toys (pixels made out of legos) and incorporating some rounded lines, added movement and bright colors to show that there is more to QR codes than black and white squares.
FORBES: JESS3 QR Art