Dentists sometimes tell people to stop taking aspirin before having dental surgery, as aspirin keeps the blood from clotting so easily, which can lead to problems with bleeding.

牙医有时告诉人们在实施牙科手术前停止服用阿司匹林，因为阿司匹林阻止血液如此容易凝血，这可能导致出血问题。

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Sometimes it can cause bleeding.

有时候甚至能造成出血。

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And sometimes it can cause bleeding.

并且有时候还会造成出血。

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Sometimes it can cause bleeding.

VOA: special.2009.10.20

Clopidogrel may cause bleeding, which can be serious and sometimes lead to death.

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Sometimes doctors delivered the polymer to the wrong place, causing internal bleeding and kidney damage.

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Although surgical techniques can sometimes be learned by practising on cadavers, microsurgery requiring careful control of bleeding needs living animals.

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