| 1 | They are the byproducts of another system. | |
| 2 | What' s the mechanism behind these traits? | |
| 3 | I can use a word processor but I don't understand its operation. | |
| 4 | There is no effective enforcement mechanism and remedies for workers at all. | |
| 5 | Although they work on the brain through different mechanisms, they have similar effects. |
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