| 1. | He got his training with the non-skeds .
他在不定期航空公司受过训练！ |
| 2. | It 's hard to predict how things will turn out .
事情还不定怎样呢。 |
| 3. | Farming has been an up-and-down industry .
务农一直是起伏不定的行业。 |
| 4. | He sat there dithering over his decision .
他坐在那里拿不定主意。 |
| 5. | The indefinite integral is an antiderivative .
不定积分是反导数。 |
| 6. | The candle flickered and then went out .
一开始蜡烛摇曳不定，然后就灭了。 |
| 7. | All these changes are so unsettling .
这些变化都使人心神不定。 |
| 8. | It 's not at all certain whether i 'll come tomorrow .
我明天还不定来不来呢。 |
| 9. | The nature of these damping effects is uncertain .
这些阻尼影响的性质是不定的。 |
| 10. | There were many ups and downs in the earth's numbers .
世界人口数量变化起伏不定。 |
