if left too long
如果离开太久
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Melanoma, because of its tendency to spread if left too long, may require extra treatment such as chemotherapy.
BBC: Gene test 'aids' skin cancer detection
If it delays action for too long, it runs the even-greater risk of being left behind by competitors that have succeeded in making the technology work to their advantage.
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