本期内容：

This week London Breed, San Francisco's mayor, will sign legislation making the city the first in America to ban the sale of e-cigarettes. Shops will be prohibited from stocking vaporisers and vaping fluid, and online vape stores from delivering to local addresses. Health officials argue that e-smoking's effects are unclear. But even if vaping is not risk-free, it is almost certainly much safer than inhaling cigarette smoke. Quitting tobacco is not easy, while many find vaping an effective way of giving up.

mayor: n. 市长
county/district/town mayor: 县长/区长/乡（镇）长
legislation: n. 立法；法律
making sth./sb. the first to do sth. 使之成为首例
Huawei has announced its successful development of 5G technologies, making China a leading nation in the field.
华为宣布自己成功研发出了 5G 技术，使得中国成为了这个领域的领先国家。
prohibit: vt. 阻止，禁止
prohibit sb. from doing sth. 禁止某人做某事
同义词：ban/forbid
vaporiser: n. 蒸发器（vaporizer）
vaporise: vt. 汽化（vaporize）
vapour: n. 蒸气（vapor）
water vapour 水蒸气
risk-free: adj. 无风险的
n-free 免……的
duty-free（shop/store）: 免税（店）
a salt-free diet: 一顿无盐餐食
a trouble-free journey: 一次没有麻烦的旅程
inhale: vt. 吸入，吸气
exhale: vt. 呼气
quit: vt. 离开，停止
quit job: 离职
quit tobacco = give up smoking: 戒烟

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