normally open

基本解释

Control mode: Normally open □, NC □, self-protection type □.
控制方式：常开□、常闭□、自保式□。
Normally Open A contact pair that is open when the relay is not energized.
在继电器未受激励时保持闭合的触点对。
Control Type:Normally Closed, Normally Open, Double Acting.
控制形式：常闭型、常开型、双作用型。

That means they can hitch-hike around in ways that would not normally be open to them because of their fragility.
ECONOMIST: Foulpox
While it is possible to open up one account then split it later to benefit multiple children, it is normally better to open up a separate account for each child or grandchild.
FORBES: Paying for College: 529 Accounts Help Parents
The build-up in excess reserves reduced the money creation that would normally have accompanied net open market purchases of assets.
FORBES: Big Fed Profits Are Another Benefit Of Wise Balance-Sheet Expansion