The glass product is fragile, it must be careful.

玻璃制品易碎， 必须小心轻放。

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Last, it must be careful in using color to adjusting athletes' emotions.

在对运动员进行情绪调节时，使用颜色调节应小心慎重。

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Conclusion: treatment of infection with inadequate debridement and retention of the prosthesis may cause sinus tract formation and affect the latter treatment, it must be careful.

结论：不适当的保留假体清创很容易导致人工髋关节置换术后感染的窦道形成，影响感染的治疗，应慎重应用。

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But you must be careful. It is easy to get lost in the waves of moving sand especially during sandstorms.

VOA: special.2010.01.04

Even as Callaway tries to attract younger golfers, it must be careful not to alienate its core older customers.

WSJ: Justin Timberlake Tries to Bring Sexy Back to Golf

The US needs to parlay armaments for revenue and influence but it must also be careful whom it entrusts with such destructive capabilities.

FORBES: Is Baghdad Becoming Tehran's Military Weapons Pipeline?

On a more sceptical note, Thomas Kirchner in the Sueddeutsche Zeitung describes the EU as a "quarrelling bunch of more or less bankrupt states" and says the Nobel committee "must be careful if it wants its decisions to be taken seriously for much longer".

BBC: EU's Nobel Peace Prize: Europe's press has mixed response