由于基因兴奋剂具有较高的隐蔽性，使检测成为难题。
Gene doping is concealable, so that it is difficult to detection.
他被怀疑服用了兴奋剂，但他的尿样检测却呈阴性的。
He was suspicious of having taken dopes, but his urine test was negative.
他被怀疑服用了兴奋剂，但他的尿样检测却是呈阴性的。
He was suspicious of having taken dopes, but his urine test was negative.
他被怀疑服用了兴奋剂，但他的尿样检测却是呈阴性的。
He was suspicious of having taken dopes, but his urine test was negative.
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