1. My father always fumed about [at] the slowness of the buses. 我父亲总是为了公车行驶缓慢而生气。
2. But it is still the major cause of slowness in using operation research. 然而，这仍是作业研究应用缓慢的主要原因。
3. Fundamentally speaking, the accumulation of difficult employment in these years is caused by the slowness and tardiness of enterprise innovation and extension of core employment. 从根本上说，这些年就业困难的积累是企业创新和核心就业扩展缓慢的严重滞后所导致的。
英英解释
n.
1. unskillfulness resulting from a lack of training
2. a rate demonstrating an absence of haste or hurry
3. lack of normal development of intellectual capacities
