Mệnh đề quan hệ 3. What makes engineers difficult in designing effective side airbags? 4. Why are not occupants always saved by the airbag? 5. What do car makers do to prevent the ineffective work of the airbag?
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2. What do those whose job is making car do to protect___?
3.What makes engineers difficult in the process of designing effective___?
4. Why are not occupants who are saved by___?
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