2. Also, because
thrum blister easily, so must use palm meticulous ground flat.
再就是,因为线头容易起泡,所以必须用手掌细致地压平。
3. An example is the S/s gene, which determines pin(s) and
thrum(S) style length in certain species of Primula.
例如报春属植物中决定花柱长短为针式型(s)还是线式型(S)的S/s基因。