这张好，很结实，线条很美。
急流是波浪形的线条，从西部到东部，穿梭了美国的北部地域，很美丽。
The jet stream was shown as a wavy line going nicely west to east across the northern half of the USA.
急流是波浪形的线条，从西部到东部，穿梭了美国的北部地域，很美丽。
The jet stream was shown as a wavy line going nicely west to east across the northern half of the USA.
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