If the character is an opening parenthesis, push it onto the stack.

如果字符是个开括号，把它压入堆栈。

youdao

An applicant shall be responsible for the preparation of the tools and place for the sampling, and the move, stack transfer, opening and repackage, etc.

报验单位应当负责抽样所需工具和场地的准备，以及抽样时的搬移、倒垛、开拆和恢复包装等事项。

youdao

But it was the home side who created the first opening when Peter Lipcsei sent Rosa running clear into the box - only for Graham Stack to stretch out a hand to block his clipped shot.

BBC: SPORT | Football | Europe | Ferencvaros 3-1 Millwall