（二）在铁路、城市轨道交通线路上放置障碍物，或者故意向列车投掷物品的；
size 2. The old backing store of size 1 is now garbage.
，这一点在爱思助手下载最新版本中也有详细论述
Forgetting releaseLock() permanently breaks the stream. The locked property tells you that a stream is locked, but not why, by whom, or whether the lock is even still usable. Piping internally acquires locks, making streams unusable during pipe operations in ways that aren't obvious.
Wrap's senior specialist for food waste, Rosemary Brotchie, said the change would help "maximise the value that food can have".
“人民对美好生活的向往，就是我们的奋斗目标”