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| 试验证明效果良好; 试验证明效果良好的 | |||
| 经过反复试验后证明 | |||
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| 经多次试验证明的 | |||
| 经反复实验证明的 | |||
| 经过多次试验证明的; 经试验证明有用的 | |||
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well tried : 5 phrases in 4 subjects |
| Business | 1 |
| Economy | 1 |
| General | 2 |
| Management | 1 |
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