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tungsten
Tungsten is a very hard metal that is resistant to high temperatures.
lanthanum, La
Lanthanum is one of the chemical elements, and its symbol is La.
a system of measurement
In this experiment, we will use the International System of Units.
a detective (person employed to find information) / a spy
He is a very excellent detective.
to covertly investigate
He went out in the middle of the night to covertly investigate the incident.
(trigonometry) tangent
Calculating the value of the tangent, which is one of the trigonometric functions, is difficult.
tank (container) / tank (military vehicle)
How many liters of water can this tank hold?
a button (clothing) / a button (mechanical device)
He buttoned up his shirt.
dantian
He practices the dantian breathing method every day.
red and green
His painting has beautiful red and green hues.
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