Have a smack at
嘗試做某事
?? 詞語組成解析
have
[h?v]
aux. 用以構成完成式及完成式的不定式，表示已經…;
vt. 有，具有;拿，取得;從事;必須，不得不;
n. 〈口〉有產者，有錢人;富國;〈英俚〉欺騙，詐騙;
have=possess持有 → 有
smack
[sm?k]
vt. 拍，打，摑;
n. 掌摑（聲）;海洛因;（打的）一拳;打巴掌;
adv. 直接地;準確地;猛烈地;急劇地;
at
[?t]
prep. （表示位置）在;在（某時間或時刻）;以，達; 向，朝;
n. 阿特（老撾輔幣單位，100 阿特 = 1 基普）;
??? 情景例句
That's great. I'll come back right after the formalities.
那太好了。手續辦完后我就回來。
When will he come to see you?
他什么時候來看你？
and by measuring the time interval between the taps and the receipt of the echoes, the depth of the sea at that point can be calculated.
測出回聲間隔的時間，便可算出該處海洋的深度。