Definition: a loud, deep sound Level: C2
狮子的吼声响彻大草原。
The lion's ___roar echoed through the savanna.
喷气发动机的轰鸣声震耳欲聋。
The ___roar of the jet engine was deafening.
生活在飞机发动机持续不断的轰鸣声中是具有挑战性的。
Living under the constant ___roar of aircraft engines is challenging.
