美研究：
New research in the U.S. shows that many toothpastes contain dangerous metals, like lead.
美國的新研究顯示，許多牙膏含有危險金屬，例如鉛。
contain(v.)包含、含有container(n.)容器metal(n.)金屬precious metal貴重金屬lead(n.)鉛(v.)引導
Of 51 toothpastes tested, 90% contained some lead.
在檢驗的51款牙膏中，有90%含有一些鉛。
These included natural toothpastes for children and brands like Crest and Colgate.
這些牙膏包括兒童用的天然牙膏，以及像是Crest和Colgate等品牌。
natural(adj.)天然的、自然的(n.)天生具有…才能的人natural resources自然資源nature(n.)大自然、性格brand(n.)品牌a brand of sth.獨特的…(風格、舉止等)
Tamara Rubin shared the test results on her blog “Lead Safe Mama.”
塔瑪拉·魯賓在她的部落格「Lead Safe Mama」上分享了檢驗結果。
result(n.)結果(v.)導致as a result of sth.由於…
In April 2025, she told The Guardian that she first discovered lead in children’s toothpaste 12 years ago.
在2025年4月，她告訴《衛報》她在12年前首次發現兒童牙膏中含有鉛。
discover(v.)發現discovery(n.)發現
Because lead is harmful to both children and adults, she asked her blog readers to help pay for lab tests.
由於鉛對兒童和成人都有害，她請求部落格讀者幫助支付實驗室檢驗費用。
harmful(adj.)有害的harm(v.)(n.)損害、傷害pay for sth.支付…的費用
The tests also found small amounts of other harmful metals like cadmium and arsenic.
檢驗還發現了少量其他有害金屬，如鎘和砷。
small amounts of少量的、微量的
Rubin believes that even small amounts of lead or other metals are dangerous.
魯賓認為，即使是少量的鉛或其他金屬也很危險。
believe+that子句=認為…
However, toothpaste companies have not agreed to remove them.
然而，牙膏公司尚未同意去除這些金屬。
agree to同意、答應(某個提議或要求)remove(v.)去掉、消除removal(n.)去掉、除去
Some companies say it is not a problem because metals are found in nature.
一些公司表示，這不是問題，因為金屬在自然界中是常見的。
Guardian notes that the tests did not show harmful metals above the safe limit set by the U.S. Food and Drug Administration.
《衛報》指出，檢驗顯示牙膏中的有害金屬並未超過美國食品藥品監督管理局所設的安全限值。
note(v.)提到、指明limit(n.)(v.)限制be limited to doing sth.僅限於做某事
While some U.S. states have stricter rules for metals in food, most do not regulate toothpaste.
雖然美國某些州對食物中的金屬有更嚴格的規定，但大多數州對牙膏並未設立相關規範。
while(conj.)儘管、雖然strict(adj.)嚴格的be strict with sb.對某人嚴格regulate(v.)管理、為…制定規章regulation(n.)規則、規章