The new investment system came into operation in 1999.

【operation】这套新的投资系统于 1999 年开始运作。

The new rule comes into operation on February 1.

【operation】这一新规定于 2 月 1 日起生效。

When a person is ill, the body’s natural defence mechanisms come into operation.

【mechanism】生病时，人体内的自然防御机制就会开始工作。

Unfortunately, at that point this hex, ' she waved impatiently at Marietta's concealed face, 'came into operation and upon catching sight of her face in my mirror the girl became too distressed to tell me any more.'

遗憾的是，当时这些毒咒，”她朝玛丽埃塔藏在袍子里的脸不耐烦地挥了挥手，“开始起作用了，她在我的镜子里忽然看到自己的面孔后，就伤心得没办法再多跟我讲了。”

The Constitutional Convention decided that the document would come into operation after ratification from nine states, and stipulated that special conventions were to be elected by the states for the purpose of ratifying the document.

制宪会议决定该文件须经九个州批准后生效，并规定各州应选举特别会议来批准该文件。

As Minister responsible for local government, we need you to authorise that the revised Paragraph 5 of No. 2 Regulation 1971 shall come into operation on March 18th, next, revoking Regulation 7 of the Local Government Allowances Amendment Regulations 1954 (b) .

作为负责管理地方政府的大臣，我们需要您授权《1971 年 2 号条例》已修改的第五段可于次年 3 月 18 日生效，并废除《1954 年(B)地方政府津贴修正案条例》的 7 号条例。