| bì | certainly/must/will/necessarily |
| 必 | certainly must will |
| 必不可少 | absolutely necessary indispensable essential |
| 必不可少组成 | absolute necessity sine qua non |
| 必争之地 | hotly contested spot; a place of strategic importance |
| 必修 | a required course |
| 必修课 | required course compulsory course |
| 必和必拓 | BHP Billiton (Anglo-Australian mining corporation) |
| 必备 | essential |
| 必备条件 | essential condition |
| 必定 | be bound to be sure to |
| 必将 | inevitably |
| 必应 | Bing (search engine) |
| 必得 | must have to |
| 必恭必敬 | be extremely deferential |
| 必死之症 | terminal illness incurable condition (also fig.) |
| 必然 | inevitable certain necessity |
| 必然产物 | the inevitable outcome |
| 必然因果关系 | the positive causal relationship |
| 必然性 | inevitability; necessity; inescapability; certainty; certitude |
| 必然王国 | realm of necessity |