即使到目前为止你还没有在合作中遇到什么严重的问题，任何一个合作都面临着一系列的挑战。
Even though you may not encounter severe difficulties that would result in the failure of the partnership, each collaboration will come with a particular set of challenges.
即使到目前为止您已经执行了所有操作，但您仍然没有足够的信息来计算该解析树表示的算术运算的结果。
With everything you've done so far, however, you still don't have quite enough information to calculate the results of the arithmetic operation represented by this parse tree.
到目前为止，没有证据表明，任何人曾因食用适当烹煮的家禽或家禽制品感染疾病，即使这些食品曾受到H5N1病毒的污染。
To date, no evidence indicates that anyone has become infected following the consumption of properly cooked poultry or poultry products, even when these foods were contaminated with the H5N1 virus.
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