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| 1. | Because the duration of action of the toxin is limited, treatment of ten must be given about every three |
| 因为此毒素的作用时期是有限的，每三个月必须治疗一次。 |
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| 2. | But because of the uncertain duration of the benefits, it is almost universal practice to treat expenditures |
| 但由于这些好处的存续期不确定,一般实践中几乎全都将这类性质的支出作为当期费用处理。 |
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| 3. | no homosexual behavior( riding) like cows in horses, estrus detection in horses in easier than cows because |
| * 不像牛有同性恋（牛骑母牛）对于马而言没有，马的发情（情持续5-7天）断不容易，因为发情持续期比牛（情持续18-19小时）。 |
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