How about evst

1. Legal holding, illegal centralized exchange

2. / sti:v/ Come on, Steve. Steve's OK

3. Stevlla in Chinese: "stevla.";.

4. Steve

5. What you should say is STEL, which belongs to the short-term exposure value. Generally speaking, it means that in the environment of toxic and harmful gases, when people are in this concentration range, there will be no permanent and irrecoverable injury or decrease of body alertness within 15 minutes. Generally, this STEL value is included in the toxic and harmful gas detector, Its alarm value can be adjusted according to customer requirements.