Investigation: an official examination of the facts about a situation, crime, etc. (正式的)调查,侦查 countable uncountable ~ (into sth)
a criminal/murder/police investigation 刑事╱凶案╱警方调查
The police have completed their investigations into the accident. 警察已完成对这次事故的调查.
She is still under investigation. 她仍在接受调查.
Intervene: to become involved in a situation in order to improve or help it 出面;介入 V ~ (in sth)
The President intervened personally in the crisis. 总统亲自出面处理这场危机.
She might have been killed if the neighbours hadn't intervened. 要不是邻居介入,她可能会没命了.
Shoddy: (of goods, work, etc. 商品、工作等) made or done badly and with not enough care 做工粗糙的;粗制滥造的;劣质的
I always complain about bad service or shoddy goods. 我时时抱怨服务不周、商品低劣.
He was accused of shoddy workmanship. 有人指责他做工粗糙.