No two threads will be able to execute methods against those objects at the same time (on a per-object basis, obviously).

不会存在两个线程同时调用该对象的方法的情况（显然是以对象为基础的）。

youdao

To minimize the work required on a per-object basis, the default should minimize the objects for which you must specify the object lifetime.

为使针对平均每个对象所需执行的工作最小化，默认设置应使需要指定生存期的对象个数最少。

youdao

We can define generic methods in one place and mix them into our Objects across multiple Class types while limiting access to sensitive methods on a per Object basis.

我们可以在一个地方定义通用的方法，然后将它们混入跨越多个类类型的对象，同时限制对每个对象为基础的敏感方法的访问。

youdao

Some people object to an opt-out system on the basis that there will inevitably be a few people who fail to opt out and fail to inform their family of their wishes, even though they would not wish their organs to be used to help others - and these people may have their organs taken without consent.

BBC: Viewpoint: Should organ donors get free funerals?