我必须十分肯定
I must be very certain
以上为机器翻译结果，长、整句建议使用 人工翻译 。
在和那家伙的来往中我必须十分小心，因为不管他看起来多诚实，可以肯定他留有后手。
I should be very cautious in any dealing with that fellow, for however honest he appears to be, you can be sure he has something up his sleeve.
youdao
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