弱回声(poor echo)：表现透声良好的暗区，如肾髓质、正常的淋巴结等。
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echo-poor 低回波
poor echo
可怜的回声
以上为机器翻译结果，长、整句建议使用 人工翻译 。
State regulators, who have been warning of the perils of poor investor protection rules in the JOBS Act for months, echo the sentiments of the other pro-investor groups and have sent a letter outlining what needs to be done.
FORBES: JOBS Act Not Ready for Prime Time; Could Be a Fraud Portal
The white paper will echo the Rogers view that many of the ills of poor areas are due to poor city design.
ECONOMIST: The pre-budget report
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