Through the modal analysis, it is found that main vibration modes of floating crane structure are swing of rope-load system and vibration of boom, and the vibration frequencies are low;

通过模态分析发现，浮吊结构的振型主要表现为主钩钢丝绳-吊重系统摆动和臂架振动，振动频率都很低；

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Mr Kerry, for his part, offered no meaningful reform of Social Security at all, despite the fact that the retirement of the baby-boom generation will soon swing the system into huge deficits.

ECONOMIST: Another small step for Kerry? | The