Englishfor English speakers
block
Noun
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A block is a hard piece of material, usually with six smooth sides.
When I was young, I liked building things with wooden blocks.
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A city block is the distance from one road to the next.
We have to walk about three blocks to the restaurant.
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In computers, a block is a restriction that prevents access to something.
I could not start a page on Wikipedia because of a block.
block
Verb
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If mathX/math is blocking mathY/math, then mathY/math can't go past mathX/math.
The water in the bath won't go down. There's something blocking the drain.
The road was blocked by police.
Excuse me! You're blocking my view. I can't see.
system
Noun
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A group of things that work together; a way of doing something.
This coloured paper is part of my system for keeping lists of people.