| 1 | Don't hang back in the face of difficulties. | |
| 2 | Dark energy is a more daunting problem still. | |
| 3 | I quite like working for the director, but his bad temper puts me off. | |
| 4 | She said some people are put off by the smell and her friends don't understand why she drinks it. | |
| 5 | One thing keeping them away could be Tsinghua's second big failure on the lists: academic citations. |