“Situation of risk in the area west of the gateway. Exercise caution, ” reads one recent message.
其中最近的一条消息写道：“公路出口的西面有危险情况，请谨慎出行。”
2
The speedlight will pre-flash that area and lock that exposure into memory. I might caution you that you have 16 seconds to then recompose and take the shot.
闪光灯会预闪并把曝光值记忆下来，注意你只有16秒的时间重新构图拍摄。
3
Caution: Exercise care to prevent purple primer or solvent cement from running back in the valve to the diaphragm or seating area.