1
by fission
Many unicellular organisms reproduce by fission.
许多单细胞生物通过分裂繁殖。
裂殖；二分裂
先理解核心含义，再看它在真实句子里的用法。
裂殖；二分裂
reproduction of some unicellular organisms by division of the cell into two roughly equal parts
Many unicellular organisms reproduce by fission.
许多单细胞生物通过分裂繁殖。
此处指生物学上的分裂生殖；核裂变另译为“裂变”。
一个物体分裂成两个的过程。
The process whereby one item splits to become two.
通过细胞分裂成两个大致相等部分的单细胞生物的繁殖
reproduction of some unicellular organisms by division of the cell into two more or less equal parts
核裂变:原子核分裂成较小粒子的过程。
nuclear fission: The process of splitting the nucleus of an atom into smaller particles.
一种核反应,大核裂变为较小核,同时释放能量
a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy
Many single-celled organisms reproduce by fission.
许多单细胞生物通过裂殖进行繁殖。
During fission, the parent cell splits into two new cells.
在裂殖过程中，母细胞分裂成两个新细胞。
Scientists observed fission in the bacteria under the microscope.
科学家在显微镜下观察到了细菌的裂殖。
Many unicellular organisms reproduce by fission.
许多单细胞生物通过分裂繁殖。
of 后接发生分裂的细胞或生物体。
The fission of the cell produces two roughly equal parts.
细胞的分裂产生两个大致相等的部分。
Not this
Nuclear fission combines a heavy atom into two lighter atoms.
Use this
Nuclear fission splits a heavy atom into two lighter atoms.
fission 指裂变，即原子核分裂（split）；combines 表示聚合，是 fusion 的定义。把 combines 改成 splits，句子才符合核裂变的物理含义。
Not this
The fission from uranium releases a lot of energy.
Use this
The fission of uranium releases a lot of energy.
表示“某物的裂变”时，fission 后要用介词 of 引出对象，即 the fission of uranium；from 不能表示这种所属或对象关系。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
核裂变
Nuclear fission produces heat in a nuclear power plant.
核裂变在核电站中产生热量。
二分裂
Bacteria reproduce by binary fission.
细菌通过二分裂进行繁殖。
裂变反应
The reactor uses a controlled fission reaction.
反应堆使用受控的裂变反应。
自发裂变
Some heavy elements undergo spontaneous fission.
一些重元素会发生自发裂变。
Use fission naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
fission 听起来像 fish（鱼）+ shun，联想一条鱼被切成两半：裂开、分裂、裂变。
语域：formal 常见场景：biology、scientific writing 该义项指单细胞生物通过细胞分裂进行繁殖，是生物学专业术语，通常用于学术文章、教材或专业讨论，比较正式，日常口语中较少见。
与 fission /ˈfɪʃən/ 真正押韵的是 mission /ˈmɪʃən/（同为 /ɪʃən/）。注意：session /ˈsɛʃən/、passion /ˈpæʃən/ 都拼作 -ssion，但元音不同；vision /ˈvɪʒən/ 虽形似，但辅音是 /ʒ/；fissure /ˈfɪʃər/ 和 issue /ˈɪʃuː/ 只是拼写或 /ʃ/ 音相似，不押韵。
Dictionary facts from ECDICT, WIKTIONARY.