| Similarity | Rank | |
|---|---|---|
| current_challenge | 0.756 | 50315 |
| the_challenge_ahead | 0.663 | 59436 |
| new_challenge | 0.646 | 18398 |
| future_trend | 0.645 | 80161 |
| major_challenge | 0.626 | 94021 |
| challenge_face | 0.626 | 32972 |
| emerge_issue | 0.612 | 75696 |
| global_challenge | 0.610 | 41446 |
| the_challenge_face | 0.603 | 22143 |
| future_development | 0.603 | 27146 |
| these_challenge | 0.601 | 16957 |
| future | 0.589 | 177 |
| challenge | 0.588 | 222 |
| specific_challenge | 0.585 | 92340 |
| future_opportunity | 0.585 | 93859 |
| change_world | 0.585 | 30814 |
| the_major_challenge | 0.584 | 66525 |
| the_key_challenge | 0.580 | 74955 |
| future_direction | 0.579 | 93309 |
| the_challenge_pose_by | 0.575 | 96527 |
| change_environment | 0.570 | 46370 |
| challenge_relate_to | 0.568 | 80453 |
| common_challenge | 0.564 | 99524 |
| current_problem | 0.556 | 54692 |
| current_development | 0.553 | 60926 |