如果你是要去露营、投宿招待所、梳化旅行，这个旅行毛巾是比必不可少的。
The PackTowl is indispensible if you're camping, hosteling, or CouchSurfing.
当然，如果你待在旅馆里，这个话题可以忽略。但是，如果你是露营、青年招待所、沙发客，这个旅行毛巾是比必不可少的。
If you're staying in hotels this isn't relevant for you, of course. But the PackTowl is indispensible if you're camping, hosteling, or CouchSurfing.
免疫接种也是保障动物卫生所必不可少的方法，重组疫苗在专一性、稳定性和安全性方面比传统疫苗更具潜力。
Vaccination is also an indispensable method for maintaining animal health, and recombinant vaccines offer potential advantages over traditional vaccines in specificity, stability and safety.
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