Sbf
[医][=serologic-blocking factor]血清封闭因子，血清阻断因子
🗣️ 情景例句
but I knew engineering was not for me.
但我知道工程对我不合适。
Beauty is but skin deep.
美丽只是皮相（指：不能以貌取人）。
In spite of all that has been said, the tourists have been picking leaves and cutting their names on the tree-trunk.
尽管有上述种种说法，但游客们还是照常摘树叶和把他们的名字刻在树干上。