An irradiation of 60 sec. limits the build-up of excessive gamma radiation levels . 采取60秒辐射限定了剩余伽玛射线水平的增高。
At low frequencies, such as 10 per sec., pulsation is sensed rather than vibration . 在低频率(譬如每秒十次)时,所感觉到的是脉冲而非振动。
There is an onset of high frequency motion which is common to both components about 1. 8 sec. after the beginning of the record . 大约在记录开始18秒后,两种分量都有高频运动出现。