Because measles attacks through the respiratory tract, though, Dr Sievers reckons this is a better place to send the vaccine than the muscles of the arm.

• 麻疹病毒通过呼吸道侵入人体，因此斯文博士（DrSievers）认为，由呼吸道接种疫苗比由胳膊上的肌肉更好。