Fission occurs when a large nucleus splits into two lighter ones.

当一个大核分裂成两个较轻的核时， 就会发生裂变。

This means that very large nuclei are not held together as strongly as small nuclei.

意思是较大的原子较小的原子不容易维持在一起。

The strong force holds protons and neutrons together to form nuclei, so once the Coulomb barrier is breached, a new and larger nucleus quickly forms.

强力将质子和中子结合在一起形成原子核，因此一旦库仑势垒被突破，就会迅速形成一个新的更大的原子核。

Unlike granulocytes, agranulocytes do not contain granules in their cytoplasm, nor do they have multi-lobed nuclei. Agrnulocytes are characterized by the presence of a single large nucleus. The two types of agranulocytes are monocytes and lymphocytes.

与粒细胞不同，无颗粒细胞在其细胞质中不含颗粒，也不具有多叶核。无颗粒细胞的特征在于其存在一个大核。两种类型的粒细胞是单核细胞和淋巴细胞。