Difficult | Operating System
| Operating System abbr. | |
| IT | sistema de exploração; sistema de operação |
| operating system abbr. | |
| comp., MS | sistema operativo |
| comp., MS Braz. | sistema operacional |
| English thesaurus | |||
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| dfclt; diffy | |||
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Difficult : 14 phrases in 8 subjects |
| Chemistry | 2 |
| Economics | 1 |
| General | 1 |
| Labor law | 1 |
| Law | 2 |
| Life sciences | 1 |
| Medical | 5 |
| Transport | 1 |