First, a range of less-dangerous gases are liberated, including tritium, krypton and xenon.
首先会释放一系列危险性较低的气体,如氚、氪和氙。
2
The building process is also lessdangerous.
建造过程也不那么危险。
3
Considered to be a lessdangerous alternative to tobacco, "e-cigarettes" are taking over the West as more and more people switch over when trying to kick the habit.