[請益] 什麼時候to+Ving。。。
One of the biggest technical challenges to getting a satellite into orbit - or a long-range missile to its target - is "getting the staging right, so that the separation and ignition occurs at the right time and in such a way that it doesn't change the rocket's trajectory," says Greg Thielmann, a senior fellow at the Washington, D.C.-based Arms Control Association.
第一行的to getting，
為什麼不可以寫 to get 呢？
謝謝。
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