Not many flight instruments existed that would help him to find his way.

当时还没有许多飞行仪器帮助他找到航线。

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Jimmy Doolittle's test flight had shown that instruments could help pilots fly.

吉米的测试飞行证明了仪器可以帮助飞行员飞行。

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Jimmy Doolittle's test flight had shown that instruments could help pilots fly.

吉米的测试飞行证明了仪器可以帮助飞行员飞行。

youdao