with a high speed 还是at a high speed?China has developed -- such a high speed.

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withahighspeed还是atahighspeed?Chinahasdeveloped--suchahighspeed.withahighspeed还是atahighspeed?Chinahas

with a high speed 还是at a high speed?China has developed -- such a high speed.
with a high speed 还是at a high speed?
China has developed -- such a high speed.

with a high speed 还是at a high speed?China has developed -- such a high speed.
at a high speed

AT

at a high speed。 固定搭配

当然是第二个

如果说某件事情用with a high speed
如果说某个运动物体用at a high speed
用with \ at都可以

at

at a high speed

at

with speed/with all speed/with great speed/with incredble speed 等语里用 with;
at full speed/at a high speed/at top speed/at low speed/at a reasonable speed 等短语里则用at.