Cheng的模型描述了在黑洞持续吞食恒星时，热等离子体反复而周期性的被注入银河晕这样的震荡波是如何形成的。
Cheng's model describes how, as the black hole continues to devour stars, shockwaves are created as hot plasma is repeatedly and periodically injected into the halo.
评论家指责他文风冗长含糊且反复，批评他时有的语无伦次和怠惰的自传体风格。
Critics accused him of being rambling, repetitious, sometimes incoherent and lazily autobiographical.
退行性椎体滑移患者最常见的主述就是腰背痛，这种疼痛往往在数年里阶段性反复发作。
The most common complaint of patients with DS is back pain. Often the pain has been episodic and recurrent for many years .
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