这是李·哈维·奥斯瓦尔德被杰克·鲁比暗杀的著名照片。
This is a famous picture of Lee Harvey Oswald who was being assassinated by Jack Ruby.
瓦尔德博士及其同事发现，这种强化复合材料的方法可以使航天材料比现有材料强韧10倍。
Dr Wardle and his colleagues found that the technique would make aerospace parts ten times stronger than at present.
瓦尔德博士及其同事发现，这种强化复合材料的方法可以使航天材料比现有材料强韧10倍。
Dr Wardle and his colleagues found that the technique would make aerospace parts ten times stronger than at present.
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