Guar gum, a plant colloid, costs less than agar and is better suited for growing thermophilic bacteria, but is also more difficult to handle, being more viscous and less transparent. The bacterial polysaccharide xanthan is cheaper as well but forms weaker jellies that, as with carrageenan, might result in puncturing its surface. Other colloids, like alginate (from brown seaweed) and gellan gum (from a bacterium), don’t set solely based on temperature and require additives for gelation. These additives might interfere with microbial growth and make the preparation of those jellies less handy than agar plates.
相比之下，对于8岁左右开始乳房发育、进展缓慢、骨龄未明显超前的孩子，国际指南多倾向于观察随访而不是立即使用抑制药物。因为在这类情况下，药物带来的身高获益往往不明确，而把发育当作“需要治疗的病”反而可能加重家庭与孩子的心理负担。
。关于这个话题，heLLoword翻译官方下载提供了深入分析
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