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| English | Chinese |
| long-distance conducting system | 长距离输导系统 |
| long-distance traffic Traffic moving over extended areas, great distances and usually not subject to frequent stops | 长途交通 (跨区域、长距离的交通运输，通常不受频繁停靠的影响。) |
| long-distance transport The conveyance of materials or commodities over land, water or through air in which a great distance is covered | 长途运输 (对材料或商品的陆地、水上、或空中的长距离传输。) |
| long-term effect Effects which will last long after the cause has ceased | 长期效应 (在原因停止后将会长期持续的影响。) |
| long-term effect of pollutants | 污染的长期效应 |
| long-term environmental stress | 长期环境胁迫 |
| 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 | 长期试验 (1. 持续相对较长一段时间的试验。 2. 其实验效果将会持续很长一段时间的试验。) |
| long-term fire danger | 长期火灾危险 |
| long-term forecasting The act or process of predicting and calculating the likely conditions or occurrences for an extended and future point in time, often involving the study and analysis of pertinent data | 长期预报 (为未来的时间点的预测和计算最可能的情况或事件的行为或过程，往往涉及对现在数据的研究和分析。) |
| long-term retardant | 长期生长抑制素 |
| long-term trend The prevailing tendency or general direction expected for some observed value over a lengthy and extended period of time, often determined by studying and analyzing statistical data | 长期趋势 (通过一段很长时间的观测值来预期流行倾向或总体方向，往往通过研究和分析统计数据而确定。) |