| |||
| eho-signal; reflektovani signal | |||
|
echo : 40 phrases in 10 subjects |
| Aviation | 3 |
| Chemistry | 6 |
| Construction | 3 |
| General | 7 |
| Microsoft | 1 |
| Oil / petroleum | 1 |
| Road traffic | 2 |
| Technology | 10 |
| Telephony | 2 |
| Television | 5 |
| |||
| eho-signal; reflektovani signal | |||
|
echo : 40 phrases in 10 subjects |
| Aviation | 3 |
| Chemistry | 6 |
| Construction | 3 |
| General | 7 |
| Microsoft | 1 |
| Oil / petroleum | 1 |
| Road traffic | 2 |
| Technology | 10 |
| Telephony | 2 |
| Television | 5 |