Objective to research the cold hardiness of snails in the constant temperature condition in laboratory, and speculate on the lower lethaltemperature of snails in dry air.
目的实验室恒温条件下初步观察钉螺的耐寒能力，推测钉螺在空气环境下的致死低温。
2
The adaptability changes of these substrates led to a drop in low semi-lethaltemperature, which was the physiological basis for increasing the cold-resistant adaptability.
这些物质的适应性变化导致低温半致死温度的下降是抗寒性提高的生理基础。
3
For copper, she said, the LC50 (the concentration lethal to half of any given species over a certain time) decreases with temperature - meaning that toxicity increases.