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be traced to追溯到
例句：The criminal was traced to Glasgow.
那罪犯被追踪到格拉斯哥。
2.The accident happened as workers were carrying out repairs to one of the plant's transformers.
carry out开展,贯彻,执行,履行,实现,完成
例句：Extensive tests have been carried out on the patient.
对患者进行了多次试验。
3.It is thought that an explosion caused the roof of the turbine hall to cave in, flooding the space with water.
cave in倒塌,坍塌,凹进,下沉;屈服,认输
例句：The wall caved in without the slightest warning.
事先大家毫无察觉的情况下墙塌了。