尽管伞状的植入性封堵器应用已稳步增长，这个理论在心脏病专家中仍具争议。
It's a controversy dividing cardiologists, even as use of umbrella-shaped implants to seal the hole shut steadily rises.
蚤缀，鹅不食：任一种蚤缀属的杂生矮小的草，开有小的通常呈白色聚伞状的花簇。
Any of numerous low-growing herbs of the genus Arenaria, having small, usually white flowers often grouped in cymose clusters.
该报告提出的技术解决方案包括从叉式捕捉器到捕捉网，再到一种伞状清扫装置。
The report proposed technological solutions ranging from harpoons to nets to an umbrella-shaped sweeping device.
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