Tripeptidyl peptidase II is found in all eukaryotic cells, which are cells that a have membrane-boundnucleus.
三肽基肽酶II存在于所有的有核膜的真核细胞中。
2
Neutrons and protons are bound together in the nucleus of an atom.
在一个原子的核内，中子和质子聚合在一起。
《柯林斯英汉双解大词典》
3
This is partly explained because the bigger an atom is, the more weakly its outer electrons are bound to it (and hence the further those electrons are from the nucleus).