a/the + adjective + fastness
fastness 在此义项中为可数名词，常用形容词修饰。
The army retreated to a mountain fastness.
军队撤退到一座山间要塞。
稳固；牢固
快速的性质或状态；使某物或某人快速的事物；要塞；巩固；迅速；[医] 抗拒性
the quality of being fixed in place as by some firm attachment
快速的性质或状态
The quality or state of being fast (in various senses).
使某物或某人快速的事物
Something that is fast, or that causes someone or something to be fast (in various senses).
The fastness of the knot kept the tent secure in the storm.
绳结的牢固让帐篷在风暴中保持稳固。
用法提示：fastness 作名词，在此表示“牢固、稳固”。
Check the fastness of the bolts before you ride the bicycle.
骑自行车前检查螺栓的紧固程度。
用法提示：fastness 是名词，指螺栓固定不动的牢固状态。
The fastness of the seal prevented any water from leaking into the box.
密封的牢固性防止了水泄漏进箱子里。
用法提示：fastness 作名词，表达“密封的牢固程度”这一含义。
fastness 在此义项中为可数名词，常用形容词修饰。
The army retreated to a mountain fastness.
军队撤退到一座山间要塞。
此义项为不可数名词，表示‘迅速’。
The cheetah runs with great fastness.
猎豹以极快的速度奔跑。
此义项为不可数名词，表示‘牢固、紧固’。
The fastness of the glue ensures a strong bond.
胶水的牢固度确保了牢固的粘合。
grammar · medium
易错句子The fastness of the runner is amazing.
正确表达The speed of the runner is amazing.
fastness 意为“要塞”或“坚固”，不表示速度，表示速度要用 speed。
grammar · medium
易错句子We need to improve the fastness of the building.
正确表达We need to improve the strength of the building.
fastness 虽有“坚固”之意，但更常指“要塞”或“固定状态”，表示建筑物的强度通常用 strength。
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