The next shuttle launch is scheduled for May when Discovery is to deliver the second portion of the Kibo laboratory to the space station.

航天飞机下一次太空使命安排在今年5月。到时候，发现号航天飞机将把日本希望号太空实验室的第二部分送到国际空间站。

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The main objective of the Endeavour mission is to deliver the third and final segment of the Japanese Kibo science laboratory.

奋进号的主要任务是载送日本希望号科学实验舱的第三部分，也是最后一部分。

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The first, scheduled for Saturday, will add a platform to the Japanese laboratory complex, Kibo, which can be used for experiments that require materials to be exposed to the harsh environment of space.

BBC: Shuttle crew welcomed aboard ISS