Instead of double-checked locking, use the Initialize-on-demand Holder Class idiom, which provides lazy initialization, is thread-safe, and is faster and less confusing than double-checked locking.
不使用双重检查锁定，而使用Initialize - on - demand Holder Class idiom，它提供了迟缓初始化，是线程安全的，而且比双重检查锁定更快且没那么混乱。
The affected eye is not able to send clear, sharp images to the brain so the main symptom of lazy eye is blurred or double vision.
受影响的眼睛是不能够传送清晰鲜明的图像到大脑，使主要症状的弱视是模糊或复视。
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