In buying a hair iron, make sure to test it before buying.
在购买了头发铁，请务必在购买之前对其进行测试。
Unless you test low in iron, get a multi without it.
除非你的测试中铁低，没有它多。
Put some iron nails at the bottom of a test tube.
把一些铁钉放在试管的底部。
Why do scientists choose iron as the test material instead of other metals?
为什么科学家选择将铁作为试验材料，而不是其他金属？
Why do scientists choose iron as the test material instead of other metals?
为什么科学家选择将铁作为试验材料，而不是其他金属？
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