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II . trace [treıs] 名词

trader [ˈtreıdə] 名词

trawler [ˈtrɔːlə] 名词

trailer [ˈtreılə] 名词

1. trailer:

tractor [ˈtræktə] 名词

tram [træm], tramcar , streetcar, trolley 名词

I . track [træk] 名词

4. track:

I . travel <travel(l)ed; travel(l)­ing> [ˈtrævəl] 动词 不及物动词

1. travel:

II . travel <travel(l)ed; travel(l)­ing> [ˈtrævəl] 动词 trans

III . travel <travel(l)ed; travel(l)­ing> [ˈtrævəl] 名词

2. travel [常作复数]:

单语范例(未经PONS编辑处理)

英语
To detect this, helium is often in the inert atmosphere inside the packaging as a tracer gas to detect leaks during testing.
en.wikipedia.org
The tracer diffusion is usually assumed to be identical to self-diffusion (assuming no significant isotopic effect).
en.wikipedia.org
Various solutions are known to circumvent these losses which include adding an inactive carrier or adding a tracer.
en.wikipedia.org
Three-dimensional images of tracer concentration within the body are then constructed by computer analysis.
en.wikipedia.org
It is often used as a tracer dye within water to determine the rate and direction of flow and transport.
en.wikipedia.org
Therefore, growth in the error vector will cause a corresponding decrease in the tracer gradient and vice versa.
en.wikipedia.org
They are commonly used as a tracer agents.
en.wikipedia.org
Isotope tracers are commonly used in the form of isotope ratios.
en.wikipedia.org
He also made an early curve tracer for alternating currents.
en.wikipedia.org
Radioactive tracers are also used to determine the location of fractures created by hydraulic fracturing in natural gas production.
en.wikipedia.org

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