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| burrow; canvass; con; concentrate on; delve; devote oneself to; dig at; dig in; dig into; dive (dived, dove); exploration; get up; make oneself the master; mug; noodlework; plough; pore; be steeped in; steep oneself in; work at | |||
| dig | |||
| grub | |||
| bite on | |||
| concentrate upon | |||
| 钻研: 32 phrases in 6 subjects |
| Construction | 2 |
| Drilling | 8 |
| Earth sciences | 3 |
| General | 8 |
| Oil / petroleum | 3 |
| Technology | 8 |