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rigorous research (Alex_Odeychuk) | |||
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in-depth study | |||
in-depth investigation | |||
deep investigation |
глубокие исследования: 16 phrases in 8 subjects |
Astronautics | 5 |
Energy industry | 2 |
Finances | 1 |
General | 1 |
Mass media | 2 |
Metallurgy | 1 |
Scientific | 3 |
Technology | 1 |