What to do when inspiration doesn't come; be careful not to spook, get the windup, force things into position. You must wait around until the idea comes.
当灵感降临时当心别把它吓跑了，别煽风点火勉强行动。你得耐心等待，好主意会水到渠成的。
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Wind tunnel measurement gives the velocity field and vorticity field in intersection plane at different downstream position, which is up to 20 times cord-length.