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| Subject | English | Spanish |
| agric. | long term experiment | experimentación al aire libre de larga duración |
| environ. | long-term experiment | experimento a largo plazo |
| environ. | long-term experiment 1. Experiment lasting for a relatively long period of time. 2. Experiment whose results become effective after a long period of time | experimento a largo plazo |
| earth.sc. | long-term weathering experiment | experimento metereológico a largo plazo |