Lots of functionality that indicate a long history. ⎕OFF exits the program, seems like back then it would turn off the machine APL runs on. There's a system function ⎕ML to switch some APL primitives to do what they would do in a different APL implementation. And of course, setting the index origin to 1 or 0 with ⎕IO.
I found the Mix comfy to wear, even with glasses. The ear cushions provide a soft but effective seal, and the headband does a decent job of distributing pressure. The clamping force felt a little aggressive when I first put them on, but after a few minutes, I got used to it and happily wore them for hours at a stretch. My only nitpick is the size of the ear cushion openings; they’re a little narrow for my taste. I prefer a roomier fit.
。关于这个话题，新收录的资料提供了深入分析
One farmer in Somerset told the BBC that he was living on a "knife edge" as his crops were days away from rotting in the floodwater.，这一点在新收录的资料中也有详细论述
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