break in; run in
Tone colorsmāmámǎmàma
Meanings
1 sense · 3 examplesverb
to break in; to run in (a new engine, vehicle, or machine)
technicalTechnical term used in automotive and mechanical engineering for the initial operation period of new machinery to allow friction surfaces to wear in and mate properly. Also written as 磨合.
Xīn新
chē车
zài在
qián前
yī一
qiān千
gōng公
lǐ里
xū需
yào要
zǒu走
hé合
，
bù不
yào要
kāi开
tài太
kuài快
。
The new car needs to be broken in during the first thousand kilometers, so don't drive too fast.
Fā发
dòng动
jī机
zǒu走
hé合
qī期
jiān间
yìng应
bì避
miǎn免
gāo高
fù负
hè荷
yùn运
zhuàn转
。
High-load operation should be avoided during the engine break-in period.
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Zhè这
tái台
jī机
qì器
hái还
xū需
yào要
zǒu走
hé合
jǐ几
bǎi百
xiǎo小
shí时
cái才
néng能
dá达
dào到
zuì最
jiā佳
zhuàng状
tài态
。
This machine still needs a few hundred hours of running-in to reach its optimal condition.