例句與造句

1. On post war units, reinforcement frames have been introduced on the chassis and under the cabs, as the first 108 units showed some mechanical weaknesses in those points; in the mid-1980s it was decided to reinforce only the chassis on pre-war units ( however units 026 an 065 never received these modifications ).
2. It's difficult to find reinforcement frame in a sentence. 用reinforcement frame造句挺難的