如有必要，可重复注射。
然而，即使在科学家重复注射了更多类型和更大剂量的癌症细胞后，这些老鼠依然保持健康活力。
The mouse continued to thrive even after the scientists repeatedly injected it with a wide range of cancer-cell types in increasing amounts.
在全世界，高达40%的感染是由不经消毒重复使用的注射器和针头引起的。在有的国家，这一比例竟高达70%。
Worldwide, up to 40% of injections are given with syringes and needles reused without sterilization and in some countries this proportion is as high as 70%.
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